Find research datasets worth reusing

opencc-by-4.0Jun 2023View details →

Fig. 1 in New taxa, records, and data for vesicomyid bivalves from Cenozoic strata of the North Pacific region

Fig. 1. Map showing localities in western Washington State, USA. 1, coastal sites between Rasmussen Creek and Jansen Creek (Makah Formation); 2, Whiskey Creek site (Pysht Formation); 3–5, sites LACMIP loc. 12385, CSUN loc. 1583, "East Fork Bridge site" (Humptulips Formation); 6, UWBM loc. B7452 in the Canyon River (Lincoln Creek Formation); 7, SR2 and SR4, Satsop River (Lincoln Creek Formation); 8, Bear River seep deposit; 9, West Fork of Grays River (Siltstone of Unit B); 10, Frankfort (Astoria Formation); 11, sites around Rocky Point (Astoria Formation).

opencc-by-4.0Jun 2023View details →

Fig. 3 in New taxa, records, and data for vesicomyid bivalves from Cenozoic strata of the North Pacific region

Fig. 3. The vesicomyid bivalve Isorropodon humptulipsense sp. nov., from middle to upper Eocene strata in western Washington State, USA. A. Rubber cast of the paratype, NRM Mo 204722, Humptulips Formation, CSUN loc. 1583, hinge area, RV (A1), LV (A2). B. Holotype, NRM Mo 204723, Humptulips Formation, CSUN loc. 1583, internal mold, view on LV. C. NRM Mo 204724, Humptulips Formation, LACMIP loc. 12385, articulated specimen, view on anterodorsal margin showing lunular incision. D. Paratype, NRM Mo 204733, Humptulips Formation, near East Fork Bridge site, view on anterodorsal margin and anterior adductor muscle scars. E. Paratype, NRM Mo 204744, Siltstone Unit B along Grays River, specimen with partially preserved shell. F. Paratype, NRM Mo 204743, Siltstone Unit B along Grays River, internal mold showing pallial line with slight indentation on RV. G. Internal mold, USNM 534952, Humptulips Formation, CSUN loc. 1583, view on RV with pallial line curving evenly into posterior adductor muscle scar (re-illustrated from Amano and Kiel 2007).

opencc-by-4.0Jun 2023View details →

Fig. 2 in New taxa, records, and data for vesicomyid bivalves from Cenozoic strata of the North Pacific region

Fig. 2. The small vesicomyid bivalves Vesicomya? sp. 1 and sp. 2, from Oligocene seep deposits in the Lincoln Creek Formation, western Washington State, USA. A. Vesicomya? sp. 1 from the early Oligocene SR2 site, Satsop River. NRM Mo 204811, left side view (A1) and dorsal view on LV and dorsal side of actual specimen (A2); A3, A4, X-ray section through the hinge area, with our interpretations; A5–A7, 3D renderings of the specimen. B, C. Vesicomya? sp. 2 from the late Oligocene SR4 site, Satsop River. B. NRM Mo 204701, disarticulated specimen, view on RV with naticid drill hole on the umbo (B1) and on the LV showing the truncate posterior margin (B2). C. NRM Mo 204702, RV in anterior view, showing inflation and lunular incision (C1) and dorsal view, showing lunular incision (C2).

Fig. 9 in Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America

Fig. 9. Palaeogeographic map for the Tremadocian, with the location of latest Cambrian and earliest Tremadocian cephalopods (simplified from Cocks and Torsvik 2021). Abbreviations: AAC, Arctic-Alaska Chukotka; AN, Annamia; ATA, Armorican Terrane Assemblage; AV, Avalonia; BC, Boshchekul- Chingiz; CU, Cuyania; F, Florida; K, Kara; K-O, Kolyma-Omolon; NT, North Tien Shan (including Ch-Ili); PA, Palaeo-Adria; SK, Stepnyak, Selety, and Kokchetav; T, Tarim.

Fig. 3 in Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America

Fig. 3. Polished sections of samples from the lower Tremadocian (Ordovician) of Quebrada de Arenal, Trancas section, Cordillera Oriental, Jujuy, Argentina, showing the random orientation of the conchs of Ellesmeroceras humahuacaensis sp. nov. A. CEGH-UNC 27489, showing diagonal and transverse views of specimens. B. CEGH-UNC 27491. B1, several cephalopods tangentially cut, and fragments of shell material. B2, some almost transverse and oblique sections of cephalopods and a variety of undetermined shell material. B3, transverse and sagittal cuts of cephalopods and a variety of randomly oriented shell material. Scale bars 5 mm.

Fig. 2. A in Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America

Fig. 2. A. Map of South America showing the main Paleozoic geological provinces of NW Argentina. B. Map of the study area (Jujuy Province, Argentina). The satellite image from Google Earth. QA, Quebrada de Arenal (-23.474677, -65.337646); QY, Quebrada de Yacoraite (-23.3321972, -65.457527). C. General view of the outcrop where the specimens were collected along the Quebrada de Arenal. This interval is characterized by sandstone interbedded with a general interval of siltstone. D. Regional biostratigraphy and lithostratigraphy correlated with the map intervals used. Modified and updated from Balseiro and Waisfeld (2013) and Vaucher et al. (2020). R. f. anglica, Rhabdinopora flabelliformis anglica. E. Stratigraphic section of the Quebrada de Arenal with the main facies assemblages (FA) that defined the section. Modified from Vaucher et al. (2020). The position where the samples were collected is indicated and belongs to Kainella merdionalis Trilobite Biozon. Til., Tilcara Member; R., Ruspaca Member; K. t., Kainella teiichii.

Fig. 1 in Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America

Fig. 1. Cambrian and early Tremadocian cephalopod records from different localities within the paleotropical belt (compiled from literature).Abbreviations: Fm., formation; Mb., Member.

Fig. 6 in Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America

Fig. 6. Ellesmeroceratid cephalopod Ellesmeroceras humahuacaensis sp. nov. (paratype CEGH-UNC 27495a) from the lower Tremadocian (Ordovician) of Quebrada de Arenal, Trancas section, Cordillera Oriental, Jujuy, Argentina. A1, external lateral (slightly oblique) view of the coated specimen; A2, longitudinal micro-CT section; A3, detail of the apical part and adjacent chambers viewed in the micro-CT scan.

Fig. 5 in Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America

Fig. 5. Ellesmeroceratid cephalopod Ellesmeroceras humahuacaensis sp. nov. from the lower Tremadocian (Ordovician) of Quebrada de Arenal, Trancas section, Cordillera Oriental, Jujuy, Argentina. A. CEGH-UNC 27494a in lateral view (coated with ammonium chloride A1, without coating A2), intermediate view between lateral and dorsal (A3). Note the sutural lateral lobes and the bent apical part of the conch. B. CEGH-UNC 27494c in dorsal view. Note the specimen is crossed by a fracture in the rock that was fixed. C. CEGH-UNC 27501 in dorsal view with the apical part rather deformed. D. CEGHUNC 27496a in dorsal view. E. CEGH-UNC 27496c in dorsal view, partially broken externally. F. CEGH-UNC 27491b in dorsal view, with shell wall. G. CEGH-UNC 27491c in external view, showing the growth lines. Scale bars 2 mm.

Fig. 4 in Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America

Fig. 4. Virtual reconstruction of the ellesmeroceratid cephalopod Ellesmeroceras humahuacaensis sp. nov. from the lower Tremadocian, Lower Ordovician of Quebrada de Arenal, Trancas section, Cordillera Oriental, Jujuy, Argentina based on composite data of the CT scan analysis of sample CEGH-UNC 27495 (three specimens), in dorsal (A1) and lateral (A2) views.

Fig. 7 in Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America

Fig. 7. Polished sections with different orientations of the ellesmeroceratid cephalopod Ellesmeroceras humahuacaensis sp. nov. from the lower Tremadocian (Ordovician) of Quebrada de Arenal, Trancas section, Cordillera Oriental, Jujuy, Argentina. A. CEGH-UNC 27489a, sagittal and somewhat oblique cut showing part of the siphuncle, the living chamber and the camerae. B. CEGH-UNC 27489b, sagittal and oblique cut of part of phragmocone showing septal necks. C. CEGH-UNC 27489c, sagittal and oblique cut of part of phragmocone broken apically showing cameral depth. D. CEGH-UNC 27489d, oblique cut of a fragment of conch with some broken septa and part of the siphuncle visible apically. E. CEGH-UNC 27489e, oblique cut of part of a conch in which the siphuncle is partially visible. F. CEGH-UNC 24784a, nearly longitudinal cut showing the siphuncle with septal necks and connecting rings. G. CEGH-UNC 24784b, detail of siphuncle in an oblique section. Scale bars 2 mm.

Fig. 8 in Early Tremadocian cephalopods from Santa Rosita Formation in NW Argentina: the oldest record for South America

Fig. 8. Early Tremadocian (Ordovician) cephalopods from Quebrada de Arenal, Trancas section, Cordillera Oriental, Jujuy, Argentina. A. Ellesmeroceratid Ellesmeroceras sp. (CEGH-UNC 27496b) in oblique-lateral (A1) and oblique-ventral (A2) view of the uncoated specimen, and oblique-lateral view of the coated specimen (A3). Arrow points to the siphuncle. Note the sinuosity of the suture lines. B. Bassleroceratid Bassleroceras? sp. (CEGH-UNC 27497) in lateral view (B1, B2) showing exogastric curvature, low expansion rate, and external siphuncle, in apical view of the apicalmost septum preserved (B3, B4), showing the slightly compressed shape and the siphuncle position. Photographs (B1, B3) and schematic drawings (B2, B4) Scale bars: A, 5 mm, B1, B2, 2 mm; B3, B4, 1 mm. discarded order Bassleroceratida (Evans 2011: 22, and dis- 3.2 mm correspond to part of the living chamber and 4.1 cussion and references therein). We followed here the pro- mm to part of the phragmocone. It has an oral dorsoventral posal by Pohle et al. (2022), in which the family is located diameter of ca. 3 mm, an apical dorsoventral diameter of c within the subclass but not included in any particular or- 2.6 mm, and an apical lateral diameter of ca. 2.1 mm. The der, although Kröger and Pohle (2021) included the family cross-section is slightly compressed (0.8), and the siphuncle within Ellesmerocerida. See Evans (2011) for further discus- is rather large, ventral and marginal (Fig. 8B), with a diamesion about the family Bassleroceratidae. ter 34 % of that the conch diameter. The chambers are very short, ca. 0.3 mm long (Fig. 8B1). There are 10 chambers in Genus Bassleroceras Ulrich and Foerste, 1935 a length equivalent to the conch diameter, i.e., an RCL of 0.1. Type species: Orthoceras perseus Billings, 1865, from the St. Armand At 2.3°, the expansion rate is very low. CEGH-UNC 27480a Limestone, near Phillipsburg, Missisquoi County, Quebec, Canada. is a 7.4 mm long fragment of a slightly exogastric conch, of Tremadocian, Lower Ordovician. which 4 mm corresponds to part of the living chamber and Bassleroceras? sp. 3.4 mm to the phragmocone. Adapically, the dorsoventral diameter is ca. 3 mm, and the siphuncle is 1 mm wide, or Fig. 8B. 33% of that the conch diameter. The chambers are 0.3 mm Material.—CEGH-UNC 27497 and 27480a, from the Alfa- long, indicating an RCL of 0.08. The SCI is 0.16. rcito Member, Santa Rosita Formation, lower Tremadocian, Remarks.—The slightly exogastric curvature of these spec- Lower Ordovician, Quebrada de Arenal, Trancas section, imens, along with the very low expansion rate of the conch, Jujuy, Argentina. suggests that they can be assigned to the Basslerocertidae. Description.—CEGH-UNC 27497 is a 7.3 mm long frag- We would need more material in order to investigate interment of a slightly exogastrically curved conch, of which nal structures and determine more precisely the taxonomic

Fig. 7 in New records of Late Triassic wood from Argentina and their biostratigraphic, paleoclimatic, and paleoecological implications

Fig. 7. Schemes showing anatomical characters of Protophyllocladoxylon hilarioense. A. Tracheid radial pitting patterns (A1, A2). B. Cross field pitting. C. Radial system.

Fig. 6 in New records of Late Triassic wood from Argentina and their biostratigraphic, paleoclimatic, and paleoecological implications

Fig. 6. Podocarpacean wood Protophyllocladoxylon hilarioense sp. nov. (CTES-PB 14409) from Upper Triassic, Hilario Creek, San Juan province, Argentina. Longitudinal radial section. Flattened biseriate and uniseriate pits (A1); flattened uniseriate and biseriate pits (A2); cross fields with phyllocladoid oopores (A3, arrow).

Fig. 4 in New records of Late Triassic wood from Argentina and their biostratigraphic, paleoclimatic, and paleoecological implications

Fig. 4. Schemes showing anatomical characters of Baieroxylon cicatricum. A. Tracheid radial pitting patterns (A1, A2). B. Cross field pitting. C. Radial system. D. Detail of scar.

Fig. 5 in New records of Late Triassic wood from Argentina and their biostratigraphic, paleoclimatic, and paleoecological implications

Fig. 5. Podocarpacean wood, Protophyllocladoxylon hilarioense sp. nov. from Upper Triassic, Hilario Creek, San Juan province, Argentina. Transverse sections (A1–A3); radial longitudinal sections of earlywood (A4–A10, B); tangential longitudinal sections (A11, A12). A. CTES-PB 14409, the general aspect of the wood (A1), secondary xylem with growth rings (A2), tracheids of late wood (arrow, A3); uniseriate pits and flattened pits (A4, A5), biseriate and alternate pits (A6), uniseriate flattened pits (black arrow) and biseriate opposite pits (white arrow) (A7), opposite pits (black arrow) and subopposite pits (white arrows) (A8), cross-fields with oblique to horizontal phyllocladoid oopores (A9, A10), uniseriate rays (A11, A12). B. CTES-PB 14406, uniseriate pits and flattened pits (B1), mixed pits with a tendency to abietinoid (B2), uniseriate separate pits (B3).

Fig. 1 in New records of Late Triassic wood from Argentina and their biostratigraphic, paleoclimatic, and paleoecological implications

Fig. 1. Location of petrified woods. A. Location of the study area at San Juan province, Argentina. B. Hilario (northern), Barreal (southern) and Rincón Blanco depocenters of Cuyana Basin. The satellite image taken from Google Earth Pro. C. Location map of the Hilario Creek, in the Hilario (northern) depocenter. Modified from Ruiz and Bodnar (2019).

Fig. 3 in New records of Late Triassic wood from Argentina and their biostratigraphic, paleoclimatic, and paleoecological implications

Fig. 3. Ginkgoalean wood. Baieroxylon cicatricum Prasad and Lele, 1984 (CTES-PB 14411) from Hilario Creek, San Juan province, Argentina, Upper Triassic. Longitudinal radial section of tracheids with biseriate pits (A1), Pits in the cross-fields (A2, arrows).

opencc-by-4.0Feb 2021View details →

Fig. 1 in Recurrent volcanic activity recorded in araucarian wood from the Lower Cretaceous Springhill Formation, Patagonia, Argentina: Palaeoenvironmental interpretations

Fig. 1. Map showing location od the study area (A) and the three fossiliferous localities (asterisked) of the Springhill Formation, Santa Cruz Province, Argentina (B). C. Stratigraphic section of the Springhill Formation in the Estancia El Álamo locality.