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Fig. 5 in A new fossil from the London Clay documents the convergent origin of a "mousebird-like" tarsometatarsus in an early Eocene near-passerine bird

Fig. 5. Strict consensus tree of 714 most parsimonious trees (L = 331, CI = 0.32, RI = 0.57) resulting from an analysis that, concerning the extant taxa, was constrained to the results of current molecular analyses (Prum et al. 2015; Kuhl et al. 2021). Extinct taxa are indicated by a dagger.

Fig. 3 in A new fossil from the London Clay documents the convergent origin of a "mousebird-like" tarsometatarsus in an early Eocene near-passerine bird

Fig. 3. Leg bones of the morsoravid bird Sororavis solitarius gen. et sp. nov. in comparison to those of other Morsoravidae and the Psittacopedidae and Zygodactylidae. A. Sororavis solitarius gen. et sp. nov. (holotype, NMS.Z.2021.40.75), from the early Eocene London Clay of Walton-on-the-Naze, UK, right tarsometatarsus (mirrored), in dorsal (A1), plantar (A2), and medial (A3) views, the arrow indicates an enlarged detail of the distal end; distal end of right tarsometatarsus (mirrored) in distal view (A4). B. Morsoravis sedilis Bertelli, Lindow, Dyke, and Chiappe, 2010 (holotype, MGUH 28930), from the early Eocene Fur Formation in Denmark, left tarsometatarsus in dorsal (B1) and medial (B2) views; coated with ammonium chloride, in B1, surrounding matrix was digitally removed and a missing portion of the shaft is highlighted by the grey-brown area, the arrow in B2, indicates an enlarged detail of the distal end. C. Pumiliornis tessellatus Mayr, 1999 (SMF-ME 2475A), from the latest early or earliest middle Eocene of Messel, Germany, left tarsometatarsus in dorsal (C1) and plantar (C2) views. D. Psittacomimus eos Mayr and Kitchener, 2022 (NMS.Z.2021.40.39), from the early Eocene London Clay of Walton-on-the-Naze, UK, left tarsometatarsus in dorsal (D1), plantar (D2), and distal (D3) views. E. Primozygodactylus cf. danielsi Mayr, 1998 (Zygodactylidae) (NMS.2021.40.49), from the early Eocene London Clay of Walton-on-the-Naze, UK, distal portion of right tarsometatarsus (mirrored), in dorsal (E1), plantar (E2), and distal (E3) views. Scale bars 5 mm.

Fig. 2 in A new fossil from the London Clay documents the convergent origin of a "mousebird-like" tarsometatarsus in an early Eocene near-passerine bird

Fig. 2. Beak and selected postcranial bones of the morsoravid bird Sororavis solitarius gen. et sp. nov. in comparison to those of other Morsoravidae and the Psittacopedidae, Zygodactylidae, and Coliiformes. A. Morsoravis sedilis Bertelli, Lindow, Dyke, and Chiappe, 2010 (holotype, MGUH 28930), from the lower Eocene Fur Formation in Denmark; A1, skull in dorsolateral view (coated with ammonium chloride); A2, distal end of left tibiotarsus in cranial view. B. Sororavis solitarius gen. et sp. nov. (holotype, NMS.Z.2021.40.75), from the early Eocene London Clay of Walton-on-the-Naze, UK. B1, tip of upper beak in dorsal view; B2, right coracoid in dorsal view; B3, composite image of partial right humerus (mirrored) and distal end of left humerus in cranial view; B4, distal end of left tibiotarsus in cranial view. C. Primoscens carolinae Mayr and Kitchener, 2022 (Zygodactylidae) (holotype, NMS.2021.40.54), from the early Eocene London Clay of Walton-on-the-Naze, UK, left coracoid in dorsal view (mirrored). D.?Psittacopes occidentalis Mayr and Kitchener, 2022 (Psittacopedidae) (holotype, NMS.Z.2021.40.44), from the early Eocene London Clay of Walton-on-the-Naze, UK, left coracoid in dorsal view (mirrored). E. The extant Myiarchus tyrannulus (Statius Müller, 1776) (Passeriformes, Tyrannidae) (SMF 9584), right coracoid in dorsal view. F. Pumiliornis tessellatus Mayr, 1999 (SMF-ME 2475B), from the luppermost lower or lowermost middle Eocene of Messel, Germany; F1, right humerus in cranial view (mirrored); F2, distal end of left tibiotarsus in cranial view. G. Parapsittacopes bergdahli Mayr, 2021 (Psittacopedidae) NMS. Z.2021.40.43), from the early Eocene London Clay of Walton-on-the-Naze, UK, right humerus in cranial view. H. Primozygodactylus cf. danielsi Mayr, 1998 (Zygodactylidae) (NMS.2021.40.49), from the early Eocene London Clay of Walton-on-the-Naze, UK, right humerus in cranial view (mirrored). Scale bars 5 mm.

Fig. 1 in A new fossil from the London Clay documents the convergent origin of a "mousebird-like" tarsometatarsus in an early Eocene near-passerine bird

Fig. 1. The bones preserved in the holotype of the morsoravid bird Sororavis solitarius gen. et sp. nov. (NMS.Z.2021.40.75), from the lower Eocene London Clay of Walton-on-the-Naze, UK. A1, tip of upper beak in dorsal view; A2, fragments of mandible; A3, A4, left coracoid in dorsal (A3) and ventral (A4) views; A5, A6, right coracoid in dorsal (A5) and ventral (A6) views; A7, partial furcula; A8, A9, cranial portion of sternum in ventral (A8) and lateral (A9) views; A10, A11, partial right humerus in cranial (A10) and caudal (A11) views; A12‒A15, proximal (A12, A13) and distal (A14, A15) portions of left humerus in caudal (A12, A14) and cranial (A13, A15) views; A16, proximal end of right ulna in cranioventral view; A17, A18, partial left tibiotarsus in caudal (A17) and cranial (A18) views; A19‒A24, right tarsometatarsus in dorsal (A19), medial (A20), plantar (A21), lateral (A22), proximal (A23), and distal (A24) views; A25, A26, proximal end of left tarsometatarsus in plantar (A25) and dorsolateral (A26) views; A27, first phalanx of third toe in dorsal and plantar view; A28, second to fourth phalanges of fourth toe in different views (plantar, dorsal, and lateral, respectively).

opencc-by-4.0Jun 2022View details →

Frictional Properties of Opalinus Clay: Influence of Humidity, Normal Stress and Grain-size on Frictional Stability

We designed frictional experiments to characterize the effect exerted by humidity, grain size and normal stress on frictional behaviour of the Opalinus clay fault gouge. We explored a wide range of normal stresses, ranging from 5 to 70 MPa performing velocity up-steps from 1 to 300 μm/s and slide-hold-slide from 1 to 3000s. Our experiments confirms that the OPA clay is weak, with friction coefficients at steady-state of ~0.35 and ~0.41, for 100% RH and 25% RH experiments, respectively. The OPA clay is velocity strengthening over the entire range of applied normal stress. We observe a direct relationship between frictional parameter (a-b) and slip velocity up to 35 MPa where, from there on, (a-b) parameter seems to be velocity independent. As evidenced by the microstructural analysis, we suggest that this behaviour is due to the progressive transition with normal stress, from strain localization and grain size reduction to distributed deformation on well-developed phyllosilicate networks. The amount of relative humidity does not affect deformation mechanisms (i.e. localized or distributed), whereas decreases fault strength and increases fault stability. We hypothesize that this is due to a possible interplay of OPA clay swelling and lubrication, caused by the weakening of chemical bonds between phyllosilicate foliae.  Notably, the initial grain size (< 63 µm or 63 < g.s. < 125 µm) does not affect either the frictional strength or stability, with similar values of dilation upon velocity up-step. Collectively, our mechanical and microstructural observations have allowed us to build a conceptual model that summarizes the main mechanical features of the OPA clay fault gouge. In the context of deep geological repositories (DGR), our results confirm that slow aseismic slip is the most likely slip behaviour for a fault gouge hosted in the OPA clay, with similar mineralogical composition and clay fabric as our samples. Beyond the context of deep geological repositories, this study has also implications for carbon capture and geological storage in the deep subsurface. Indeed, OPA has the characteristics of a low permeability caprock, but faulted, and the integrity of a sealing caprock overlying a storage reservoir can evolve after fault reactivation, potentially generating undesired seismicity and new hydraulic pathways. The data are uploaded are structured as follow: 1) A .txt file of the datafile that is recorded from the machine (raw data) 2) A file in .txt format containing the elaborated data (data_rp)   The data are analyzed using rawPy that can be found at <a href="https://github.com/marcoscuderi/rawPy">https://github.com/marcoscuderi/rawPy</a> For any additional information please do not hesitate to contact the corresponding author Nico Bigaroni at nico.bigaroni@uniroma1.it

opencc-by-4.0Sep 2020View details →

Spectral induced polarization of non-consolidated clays

We present a spectral induced polarization dataset on four different types of clay (red and green montmorillonite samples, kaolinite sample, and illite sample) at five different salinities (from de-ionised water to 1 mol/L NaCl), and additionally two other clay samples (beige montmorillonite sample and Boom clay sample) at three differente salinities (from de-ionised water to 1 mol/L NaCl). Each file has its header, describing each column. The logic of the filenames is: "Clay type_salinity_SIP_raw".txt These results are published in Mendieta et al. (2021): https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JB021125 (pre-print: doi:10.1002/essoar.10505885.2)

Text-fig. 6. Ternstroemites klettwitzensis sp. nov. a: Holotype, Inv.-No. 19076-2, scale bar 10 mm; b: Holotype, Inv.-No. 19076-2, detail, scale bar 1 mm; c: Inv.-No. 18091-1, scale bar 5 mm; d: Inv.-No. 18091-1, detail, scale bar 1 mm; e: Ternstroemites klettwitzensis sp. nov., Inv.-No. 18092-1, scale bar 10 mm; f: Inv.-No. 11024-1, scale bar 5 mm; g: Inv.-No. 18093, scale bar 10 mm; h: Inv.-No. 18093, detail, scale bar 1 mm. in New Leaf Species From The Upper Miocene Flora Of The Leaf-Bearing Wischgrund Clay (Lower Lusatia, Brandenburg, Germany)

Text-fig. 6. Ternstroemites klettwitzensis sp. nov. a: Holotype, Inv.-No. 19076-2, scale bar 10 mm; b: Holotype, Inv.-No. 19076-2, detail, scale bar 1 mm; c: Inv.-No. 18091-1, scale bar 5 mm; d: Inv.-No. 18091-1, detail, scale bar 1 mm; e: Ternstroemites klettwitzensis sp. nov., Inv.-No. 18092-1, scale bar 10 mm; f: Inv.-No. 11024-1, scale bar 5 mm; g: Inv.-No. 18093, scale bar 10 mm; h: Inv.-No. 18093, detail, scale bar 1 mm.

Text-fig. 7. Ternstroemites klettwitzensis sp. nov. a: Inv.-No. 18051-1, scale bar 10 mm; b: Inv.-No. 3367-1, scale bar 10 mm; c: Inv.-No. 18014, scale bar 10 mm; d: Inv.-No. 18044-1, scale bar 1 mm; e: Inv.-No. 18047-1, scale bar 2 mm; f: Inv.-No. 18070-1, scale bar 2 mm. in New Leaf Species From The Upper Miocene Flora Of The Leaf-Bearing Wischgrund Clay (Lower Lusatia, Brandenburg, Germany)

Text-fig. 7. Ternstroemites klettwitzensis sp. nov. a: Inv.-No. 18051-1, scale bar 10 mm; b: Inv.-No. 3367-1, scale bar 10 mm; c: Inv.-No. 18014, scale bar 10 mm; d: Inv.-No. 18044-1, scale bar 1 mm; e: Inv.-No. 18047-1, scale bar 2 mm; f: Inv.-No. 18070-1, scale bar 2 mm.

Text-fig. 4. Pyracantha pseudococcinea sp. nov. a: Holotype, Inv.-No. 3470-3, scale bar 5 mm; b: Inv.-No. 11034, scale bar 5 mm; c: Inv.-No. 18279, scale bar 5 mm; d: Inv.-No. 18372, scale bar 5 mm. in New Leaf Species From The Upper Miocene Flora Of The Leaf-Bearing Wischgrund Clay (Lower Lusatia, Brandenburg, Germany)

Text-fig. 4. Pyracantha pseudococcinea sp. nov. a: Holotype, Inv.-No. 3470-3, scale bar 5 mm; b: Inv.-No. 11034, scale bar 5 mm; c: Inv.-No. 18279, scale bar 5 mm; d: Inv.-No. 18372, scale bar 5 mm.

Text-fig. 2. Stratigraphic position of the Wischgrund leaf-bearing clay (arrow) on the Klettwitz Tertiary plateau. in New Leaf Species From The Upper Miocene Flora Of The Leaf-Bearing Wischgrund Clay (Lower Lusatia, Brandenburg, Germany)

Text-fig. 2. Stratigraphic position of the Wischgrund leaf-bearing clay (arrow) on the Klettwitz Tertiary plateau.

Text-fig. 4. a: Conglomeratic to massive sandstone facies 1, facies A are composed of Andesit (AF), Clay (CF) and Sandstone (SF) fragments lain on medium-sandstone. b: Conglomeratic to massive sandstone facies, outcropping of massive sandstone facies comprises of fine to medium grain size of grey to yellowish sandstone. c: Heterolithic sandstone-mudstone facies, intercalation of fine sand with silt and shale as type form of heterolithic sandstone mudstone as indicated by a high sand/shale ratio. d: Example outcrops of heterolithic sandstone-mudstone 2 indicated by low sand/shale ratio. e: Heterolithic fine sand and mudstone and mudstone facies, intercalation of thin sandstone and shale. f: Representative of slump deposits outcrops belong to conglomeratic to massive sandstone facies, which is indicated by the intercalation of sandstone and shale and some disturbed beds or layers as seen in slump deposits. The facies type is normally deposited within the basin floor, channel margin or as a product of the overbank deposits. In this figure the slump deposit is shown as internal bedding, some occurred on the bedding-plane. Trend slope measurement of the fold-axis revealed values N 135°E and N 108°E. in Lithofacies And Ichnofacies Of Turbidite Deposits, West Java, Indonesia

Text-fig. 4. a: Conglomeratic to massive sandstone facies 1, facies A are composed of Andesit (AF), Clay (CF) and Sandstone (SF) fragments lain on medium-sandstone. b: Conglomeratic to massive sandstone facies, outcropping of massive sandstone facies comprises of fine to medium grain size of grey to yellowish sandstone. c: Heterolithic sandstone-mudstone facies, intercalation of fine sand with silt and shale as type form of heterolithic sandstone mudstone as indicated by a high sand/shale ratio. d: Example outcrops of heterolithic sandstone-mudstone 2 indicated by low sand/shale ratio. e: Heterolithic fine sand and mudstone and mudstone facies, intercalation of thin sandstone and shale. f: Representative of slump deposits outcrops belong to conglomeratic to massive sandstone facies, which is indicated by the intercalation of sandstone and shale and some disturbed beds or layers as seen in slump deposits. The facies type is normally deposited within the basin floor, channel margin or as a product of the overbank deposits. In this figure the slump deposit is shown as internal bedding, some occurred on the bedding-plane. Trend slope measurement of the fold-axis revealed values N 135°E and N 108°E.

opencc-by-4.0Aug 2021View details →

Fig. 3 in A new microgastropod species, Orbitestella amphaengensis, (Gastropoda: Heterobranchia: Orbitestellidae) from Bangkok clay of Samut Sakorn Province, Thailand

Fig. 3. Holotype of Orbitestella amphaengensis, new species (ESKU-2021-I-001). A, apical view; B, early whorl; C, front view; D, protoconch; E, umbilical view; F, close-up of umbilical view.

opencc-by-4.0Aug 2021View details →

Fig. 2 in A new microgastropod species, Orbitestella amphaengensis, (Gastropoda: Heterobranchia: Orbitestellidae) from Bangkok clay of Samut Sakorn Province, Thailand

Fig. 2. The ancient Bryde's whale remains were discovered from Bangkok clay about 12 kilometres inland from the current coastline, the Gulf of Thailand. Photograph by: Adulwit Kaweera

opencc-by-4.0Aug 2021View details →

Fig. 1 in A new microgastropod species, Orbitestella amphaengensis, (Gastropoda: Heterobranchia: Orbitestellidae) from Bangkok clay of Samut Sakorn Province, Thailand

Fig. 1. Approximate location of type locality of Orbitestella amphaengensis, new species: Amphaeng Sub-district, Ban Phaeo District, Samut Sakorn Province, Thailand.

Text-fig. 10. Langtonia bisulcata REID et CHANDLER. a, b, e–g: Holotype, V. 22984, from micro-CT data. a: Dorsiventral view surface rendering. b: Dorsiventral view translucent volume rendering showing outline of locule cast. c: Equatorial transverse fracture showing paired dorsal infolds and locules with shape of a ε in cross section, reflected light, V. 22993. d: Digital transverse section from micro-CT data, of fruit with two well developed ε-shaped locules, V. 22985. e–g: Successive digital transverse sections with one well developed ε-shaped locule and infolds of the abortive locule visible in (g) (arrows). h–j: Physical transverse thin sections of specimen from middle Eocene Clarno Formation, Oregon, USA with well-preserved mesocarp including longitudinal canals in (j) (arrows), USNM 424875; Scale bars 0.5 cm in (a, b), 2.5 mm in (c–g), 5 mm in (h), 2 mm in (i), 1 mm in (j); (a, b) share same scale bar; (c, d) share same scale bar; (e, f, g) share same scale bar. in Mastixioid Fruits (Cornales) From The Early Eocene London Clay Flora: Morphology, Anatomy And Nomenclatural Revision

Text-fig. 10. Langtonia bisulcata REID et CHANDLER. a, b, e–g: Holotype, V. 22984, from micro-CT data. a: Dorsiventral view surface rendering. b: Dorsiventral view translucent volume rendering showing outline of locule cast. c: Equatorial transverse fracture showing paired dorsal infolds and locules with shape of a ε in cross section, reflected light, V. 22993. d: Digital transverse section from micro-CT data, of fruit with two well developed ε-shaped locules, V. 22985. e–g: Successive digital transverse sections with one well developed ε-shaped locule and infolds of the abortive locule visible in (g) (arrows). h–j: Physical transverse thin sections of specimen from middle Eocene Clarno Formation, Oregon, USA with well-preserved mesocarp including longitudinal canals in (j) (arrows), USNM 424875; Scale bars 0.5 cm in (a, b), 2.5 mm in (c–g), 5 mm in (h), 2 mm in (i), 1 mm in (j); (a, b) share same scale bar; (c, d) share same scale bar; (e, f, g) share same scale bar.

Text-fig. 9. Portnallia. a–j: P. bognorensis M.CHANDLER. a–g: Holotype, V. 30421. a: Oblique lateral view with dorsal surface of locule cast facing towards right side. b: Basal view (original illustration from pl. 28, fig. 40 of Chandler 1961). c–g: Micro CT data. c–f: Surface renderings. c: Lateral view with interlocular septum facing forward. d: lateral view with dorsal surface of locule facing forward. e: Basal view. f: Apical view. g: Digital transverse section near equatorial position showing (c) to u-shaped locules. h: Apical view of tetralocular fruit, V. 30423 (original illustration from pl. 28, fig. 42 of Chandler 1961). i: Transverse section of specimen in (h), reflected light. j–o: P. sheppeyensis M.CHANDLER, Holotype V. 30428, here synomomized with P. bognorensis, from micro-CT data. j–m: Surface renderings. j: Lateral view with interlocular septum facing forward. k: Lateral view with dorsal surface of locule facing forward. l: Basal view. m: Apical view. n: Digital equatorial transverse section showing the three preserved locules and extensive cracking due to pyrite decomposition. o: Translucent volume rendering, apical view showing (c) to u-shaped locules. Scale bars 2 mm, bar in (a) applies also to (b), bar in (e) applies to also to (c, d), bar in (g) applies also to (f), bar in (j) applies to applies also to (k–m). in Mastixioid Fruits (Cornales) From The Early Eocene London Clay Flora: Morphology, Anatomy And Nomenclatural Revision

Text-fig. 9. Portnallia. a–j: P. bognorensis M.CHANDLER. a–g: Holotype, V. 30421. a: Oblique lateral view with dorsal surface of locule cast facing towards right side. b: Basal view (original illustration from pl. 28, fig. 40 of Chandler 1961). c–g: Micro CT data. c–f: Surface renderings. c: Lateral view with interlocular septum facing forward. d: lateral view with dorsal surface of locule facing forward. e: Basal view. f: Apical view. g: Digital transverse section near equatorial position showing (c) to u-shaped locules. h: Apical view of tetralocular fruit, V. 30423 (original illustration from pl. 28, fig. 42 of Chandler 1961). i: Transverse section of specimen in (h), reflected light. j–o: P. sheppeyensis M.CHANDLER, Holotype V. 30428, here synomomized with P. bognorensis, from micro-CT data. j–m: Surface renderings. j: Lateral view with interlocular septum facing forward. k: Lateral view with dorsal surface of locule facing forward. l: Basal view. m: Apical view. n: Digital equatorial transverse section showing the three preserved locules and extensive cracking due to pyrite decomposition. o: Translucent volume rendering, apical view showing (c) to u-shaped locules. Scale bars 2 mm, bar in (a) applies also to (b), bar in (e) applies to also to (c, d), bar in (g) applies also to (f), bar in (j) applies to applies also to (k–m).

Text-fig. 7. Exbeckettia mastixioides (E.REID et M.CHANDLER) comb. nov. Details of anatomy in transverse section on cut surfaces from bilocular fruit shown in Text-fig. 6i, V. 23013(3). a: Details of seed (S), locule (L), distinct endocarp planes of separation (arrows). b: Detail of endocarp adjacent to the locule, and surrounding mesocarp. Blue lines indicate thickness of sclerenchyma lining the locule. Note layer of horizontally oriented periclinal fibres a few cells thick, lining the locule (arrow). c: Enlargement showing parenchyma cells of the mesocarp decreasing in diameter toward the periphery. d: Enlargement showing fibres and sclereids of the endocarp. e: Sharp contact between endocarp and mesocarp. f, g: Detailed anatomy of endocarp including locule lining, and contact with mesocarp. Scale bars 2 mm in (a), (b), 1 mm in (c–g). in Mastixioid Fruits (Cornales) From The Early Eocene London Clay Flora: Morphology, Anatomy And Nomenclatural Revision

Text-fig. 7. Exbeckettia mastixioides (E.REID et M.CHANDLER) comb. nov. Details of anatomy in transverse section on cut surfaces from bilocular fruit shown in Text-fig. 6i, V. 23013(3). a: Details of seed (S), locule (L), distinct endocarp planes of separation (arrows). b: Detail of endocarp adjacent to the locule, and surrounding mesocarp. Blue lines indicate thickness of sclerenchyma lining the locule. Note layer of horizontally oriented periclinal fibres a few cells thick, lining the locule (arrow). c: Enlargement showing parenchyma cells of the mesocarp decreasing in diameter toward the periphery. d: Enlargement showing fibres and sclereids of the endocarp. e: Sharp contact between endocarp and mesocarp. f, g: Detailed anatomy of endocarp including locule lining, and contact with mesocarp. Scale bars 2 mm in (a), (b), 1 mm in (c–g).

Text-fig. 8. Lanfrancia subglobosa E.REID et M.CHANDLER. a–c, e–g: Holotype V. 23014. a: reflected light. b, c: Surface renderings from micro-CT data. a, b: Lateral views with dorsal surface of locule facing forward and locule casts protruding in upper part. c: Apical view. d: Fruit showing two locule casts the dorsal surfaces of which face to the left and the right, V. 30417(1). e–g: Successive digital transverse sections showing four u to v to c-shaped locules from micro-CT data. h: Physical transverse section of specimen in (d). i–k: Physical transverse section, V. 30419 from Herne Bay, blue lines in K indicating limits of fibre layer lining the locule. l: Detail from (h), showing sclerenchyma composing the septa and central axis. m: Transverse section, enlargement from (i), showing anatomy of tissues adjacent to the dorsal infold. Blue lines indicate limits of the fibre layer lining the locule. n: Part of (m) recut, tangential section transecting the dorsal infold (central), both limbs of the locule cast, and peripheral parts of the pericarp on either side. o: Detail from (n), showing anatomy of the infold. Scale bars 5 mm in (a–h) (a–g share the same bar), 3 mm in (i), 1 mm in (j–m), 0.5 mm in (n), 0.2 mm in (o). in Mastixioid Fruits (Cornales) From The Early Eocene London Clay Flora: Morphology, Anatomy And Nomenclatural Revision

Text-fig. 8. Lanfrancia subglobosa E.REID et M.CHANDLER. a–c, e–g: Holotype V. 23014. a: reflected light. b, c: Surface renderings from micro-CT data. a, b: Lateral views with dorsal surface of locule facing forward and locule casts protruding in upper part. c: Apical view. d: Fruit showing two locule casts the dorsal surfaces of which face to the left and the right, V. 30417(1). e–g: Successive digital transverse sections showing four u to v to c-shaped locules from micro-CT data. h: Physical transverse section of specimen in (d). i–k: Physical transverse section, V. 30419 from Herne Bay, blue lines in K indicating limits of fibre layer lining the locule. l: Detail from (h), showing sclerenchyma composing the septa and central axis. m: Transverse section, enlargement from (i), showing anatomy of tissues adjacent to the dorsal infold. Blue lines indicate limits of the fibre layer lining the locule. n: Part of (m) recut, tangential section transecting the dorsal infold (central), both limbs of the locule cast, and peripheral parts of the pericarp on either side. o: Detail from (n), showing anatomy of the infold. Scale bars 5 mm in (a–h) (a–g share the same bar), 3 mm in (i), 1 mm in (j–m), 0.5 mm in (n), 0.2 mm in (o).

Text-fig. 6. Exbeckettia mastixioides (E.REID et M.CHANDLER) comb. nov. from the London Clay. a–f: Holotype, V. 23002, bilocular fruit. a–d: Surface renderings from micro-CT data. a: Apical view. b: Basal view. c: Lateral view with dorsal surface of locule facing forward. d: lateral view with interlocular septum facing forward. e, f: Digital sections from micro-CT data. e: transverse equatorial showing U-shaped locules and distinct dark endocarp (arrows). f: Median longitudinal intercepting both locules. g: lateral view of bilocular fruit with interlocular septum facing forward. V. 23013(3). h: Apical view of bilocular fruit with two exposed locule casts, V. 23013(1). i–l: Fruits in physical transverse section showing U-shaped locules and distinct locule lining. i: Bilocular fruit shown in (g). j: Bilocular fruit, V. 23007. k: Fruit with one locule larger than the other, V. 23006. l: Tetralocular fruit, V. 22993. Scale bar 5 mm in (a–l), bar in (a) applies also to (b–d), bar in (e) applies also to (f), bar in (j) applies to (i–l). in Mastixioid Fruits (Cornales) From The Early Eocene London Clay Flora: Morphology, Anatomy And Nomenclatural Revision

Text-fig. 6. Exbeckettia mastixioides (E.REID et M.CHANDLER) comb. nov. from the London Clay. a–f: Holotype, V. 23002, bilocular fruit. a–d: Surface renderings from micro-CT data. a: Apical view. b: Basal view. c: Lateral view with dorsal surface of locule facing forward. d: lateral view with interlocular septum facing forward. e, f: Digital sections from micro-CT data. e: transverse equatorial showing U-shaped locules and distinct dark endocarp (arrows). f: Median longitudinal intercepting both locules. g: lateral view of bilocular fruit with interlocular septum facing forward. V. 23013(3). h: Apical view of bilocular fruit with two exposed locule casts, V. 23013(1). i–l: Fruits in physical transverse section showing U-shaped locules and distinct locule lining. i: Bilocular fruit shown in (g). j: Bilocular fruit, V. 23007. k: Fruit with one locule larger than the other, V. 23006. l: Tetralocular fruit, V. 22993. Scale bar 5 mm in (a–l), bar in (a) applies also to (b–d), bar in (e) applies also to (f), bar in (j) applies to (i–l).

Text-fig. 5. Mastixiopsis nyssoides KIRCHH. a, b, g–n: Organic preservation. a, b: Lignitic, unpermineralized, early Eocene Dorset Pipe clays at Arne, V. 40762. a: Ventral view (original illustration from pl. 18, fig. 1 of Chandler 1962). b: Transverse fracture, somewhat distorted by compression. c–f: Pyrite permineralization. c: Ventral view, V. 22963(1) from Sheppey, originally listed as Mastixia cantiensis. d: Lateral view, V. 22969 from Sheppey (identified as Mastixia grandis by Reid and Chandler 1933: pl. 25, fig. 8). e: Equatorial transverse physical section from (c). f: Equatorial transverse physical section from (d). g: Detail of pericarp from (e), showing endocarp formed of dense fibrous tissue, surrounded by mesocarp of anticlinally oriented larger cells. h: Detail of pericarp from (f). i–n: Type material from Eocene of Riestadt, Germany, MNB. i: Ventral view. j, k: Ventral and apical views of holotype. l: View of the transversely fractured surface from (j) showing horseshoe shaped locule. m: Equatorial transverse physical cut of the specimen in (i); note yellow resin cavity (arrow). n: Scanning electron microscopy of pericarp from (l) with locule lining at lower edge of image. Note dense endocarp tissue composed of small cells (fibres and sclereids), extending about 3/5 of distance to periphery, surrounded by mesocarp of larger, anticlinally oriented cells. Scale bars 1 cm in (a–f), (i–k), 1 mm in (g), 2 mm in (h), 3 mm in (l), m, 250 Μm in (n). Bar in (d) applies also to (c). Bar in (l) also applies to (m). Bar in (i) also applies to (j) and (k). in Mastixioid Fruits (Cornales) From The Early Eocene London Clay Flora: Morphology, Anatomy And Nomenclatural Revision

Text-fig. 5. Mastixiopsis nyssoides KIRCHH. a, b, g–n: Organic preservation. a, b: Lignitic, unpermineralized, early Eocene Dorset Pipe clays at Arne, V. 40762. a: Ventral view (original illustration from pl. 18, fig. 1 of Chandler 1962). b: Transverse fracture, somewhat distorted by compression. c–f: Pyrite permineralization. c: Ventral view, V. 22963(1) from Sheppey, originally listed as Mastixia cantiensis. d: Lateral view, V. 22969 from Sheppey (identified as Mastixia grandis by Reid and Chandler 1933: pl. 25, fig. 8). e: Equatorial transverse physical section from (c). f: Equatorial transverse physical section from (d). g: Detail of pericarp from (e), showing endocarp formed of dense fibrous tissue, surrounded by mesocarp of anticlinally oriented larger cells. h: Detail of pericarp from (f). i–n: Type material from Eocene of Riestadt, Germany, MNB. i: Ventral view. j, k: Ventral and apical views of holotype. l: View of the transversely fractured surface from (j) showing horseshoe shaped locule. m: Equatorial transverse physical cut of the specimen in (i); note yellow resin cavity (arrow). n: Scanning electron microscopy of pericarp from (l) with locule lining at lower edge of image. Note dense endocarp tissue composed of small cells (fibres and sclereids), extending about 3/5 of distance to periphery, surrounded by mesocarp of larger, anticlinally oriented cells. Scale bars 1 cm in (a–f), (i–k), 1 mm in (g), 2 mm in (h), 3 mm in (l), m, 250 Μm in (n). Bar in (d) applies also to (c). Bar in (l) also applies to (m). Bar in (i) also applies to (j) and (k).