Find research datasets worth reusing

Fig. 22 in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 22. Relative spacing of tubercle rows in Discoscaphites minardi, n.sp. In each specimen, the umbilicolateral bullae (ul) and outer ventrolateral tubercles (ovl) are plotted on the left and right side, respectively, with the midflank swellings (mf) and inner ventrolateral tubercles (ivl) in between. M, macroconch; m, microconch.

Fig. 19. Discoscaphites minardi, n in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 19. Discoscaphites minardi, n.sp., AMNH loc. 3252, Severn Formation, Kent County, Maryland. A–K. Macroconchs. A–C. AMNH 49406. A, Right lateral; B, apertural; C, ventral. D–G. AMNH 47290. D, Right lateral; E, apertural; F, ventral; G, left lateral. H–K. AMNH 47299. H, Right lateral, I, apertural; J, ventral; K, left lateral. L–Z, a–g. Microconchs. L, M. AMNH 47294. L, Right lateral; M, ventral. N–Q, AMNH 47289. N, Right lateral; O, apertural; P, ventral; Q, left lateral. R, S. AMNH

Fig. 14. A in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 14. A. Suture of Baculites vertebralis Lamarck, 1801, AMNH 49408, at a whorl height of 10.3 mm, AMNH loc. 3252, Severn Formation, Kent County, Maryland. B. Suture of Eubaculites latecarinatus (Brunnschweiler, 1966), AMNH 49402, at a whorl height of approximately 15 mm, same locality as A.

Fig. 3 in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 3. Generalized stratigraphic sections of the Severn Formation at three sites in Maryland. The sections are arranged so that the ammonite assemblages (= zones) appear in ascending stratigraphic order from left to right. The Brightseat section is based on Owens et al. (1977: fig. 61), the Lloyd Creek section on Minard (1974: pl. 1; 1980) and Minard et al. (1977), and the Round Bay section on Minard (1980: pl. 1). The ammonites from Round Bay were probably collected from a site 2–3 km southwest of the type locality on the west side of the Severn River. According to Owens et al. (1977: fig. 61), this site is similar to the type locality. The stratigraphic position of the ammonites at Round Bay is shown with a question mark because the position is inferred based on the associated dinoflagellates with reference to the biostratigraphic zonation of the Severn Formation documented by Benson (1976) and Firth (1987).

Fig. 21 in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 21. Sutures of Discoscaphites minardi, n.sp., AMNH loc. 3252, Severn Formation, Kent County, Maryland. A. AMNH 47298, at a whorl height of approximately 12.0 mm. B. AMNH 47294, last suture at a whorl height of 9.4 mm.

Fig. 13. A–Z, a–f. Baculites vertebralis Lamarck, 1801, AMNH loc. 3252 in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 13. A–Z, a–f. Baculites vertebralis Lamarck, 1801, AMNH loc. 3252, Severn Formation, Kent County, Maryland. A–D. MAPS A2035c3. A, Dorsal; B, ventral; C, left lateral; D, whorl cross section at adoral end. E–H. MAPS A2035c2. E, Right lateral; F, dorsal; G, ventral; H, whorl crosssection at adoral end. I–L. AMNH 47428. I, Right lateral; J, dorsal; K, ventral; L, whorl crosssection at adapical

Fig. 1 in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 1. Maps of parts of New Jersey, Delaware, Maryland, and North Carolina showing localities mentioned in the text.

Fig. 18. A–Q, S–Y. Discoscaphites minardi, n in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 18. A–Q, S–Y. Discoscaphites minardi, n.sp., macroconchs, AMNH loc. 3252, Severn Formation, Kent County, Maryland. A–D. Holotype, AMNH 47288. A, Right lateral; B, apertural; C, ventral; D, left lateral. E–G. AMNH 47281. E, Right lateral; F, ventral; G, left lateral. H–K. Paratype, AMNH 47293. H, Right lateral; I, apertural; J, ventral; K, left lateral. L–N. AMNH 47295. L, Right lateral; M, ventral; N, left lateral. O–Q. MAPS A2059a1. O, Apertural; P, ventral; Q, left lateral. S–U. Paratype, AMNH 50542. S, Right lateral; T, ventral; U, left lateral. V–Y. AMNH 47283. V, Right lateral; W, apertural; X, ventral; Y, left lateral. R. Discoscaphites iris (Conrad, 1858), MAPS A2060c1, same loc. as A–Q, S–Y, left lateral. All figures ×1.

Fig. 16 in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 16. Discoscaphites gulosus (Morton, 1834), AMNH 50365, macroconch, Peedee Formation, John D. Long County Park, Brunswick County, North Carolina. A, Right lateral; B, ventral; C, left lateral. All figures ×1.

Fig. 11 in Cephalopods from the Cretaceous/Tertiary Boundary Interval on the Atlantic Coastal Plain, with a Description of the Highest Ammonite Zones in North America. Part 1. Maryland and North Carolina

Fig. 11. Composite suture of Sphenodiscus pleurisepta (Conrad, 1857) at a whorl height of approximately 27 mm, AMNH 49412, AMNH loc. 3252, Severn Formation, Kent County, Maryland.

opencc-by-4.0Aug 2019View details →

Text-fig. 2. Soft-tissue imprints and traces of bioerosion on Middle Ordovician cephalopods from Estonia. a: GIT 819-1, Tragoceras falcatum (SCHLOTHEIM, 1820), drag bands; b: GIT 819-1, T. falcatum, pseudosutures; c: GIT 819-2, Estonioceras sp., drag bands; d: GIT 819-3, cf. Anthoceras vaginatum (SCHLOTHEIM, 1820), drag bands; e: GIT 819-4, cf. Orthoceras regulare SCHLOTHEIM, 1820, drag bands; f: Pits on the body chamber of GIT 819-1, T. falcatum. Specimens oriented with aperture downwards. Scale bars 1 mm. in Conch Structures, Soft-Tissue Imprints And Taphonomy Of The Middle Ordovician Cephalopod Tragoceras Falcatum From Estonia

Text-fig. 2. Soft-tissue imprints and traces of bioerosion on Middle Ordovician cephalopods from Estonia. a: GIT 819-1, Tragoceras falcatum (SCHLOTHEIM, 1820), drag bands; b: GIT 819-1, T. falcatum, pseudosutures; c: GIT 819-2, Estonioceras sp., drag bands; d: GIT 819-3, cf. Anthoceras vaginatum (SCHLOTHEIM, 1820), drag bands; e: GIT 819-4, cf. Orthoceras regulare SCHLOTHEIM, 1820, drag bands; f: Pits on the body chamber of GIT 819-1, T. falcatum. Specimens oriented with aperture downwards. Scale bars 1 mm.

opencc-by-4.0Aug 2019View details →

Text-fig. 1. Megastriae and post mortem epicoles on Tragoceras falcatum (SCHLOTHEIM, 1820). Arrows and M1–M3 indicate megastriae, bryozoan colonies are indicated by B1 and B2. a: GIT 819-1, left lateral view; b: body chamber of GIT 819-1, dorsal view; c: body chamber of GIT 819-1, left lateral view; d: GIT 819-1, right lateral view; e: PIMUZ 37299, right lateral view; f: detail of the body chamber of GIT 819-1, right lateral view, encrusted by bryozoans; g: bryozoan colony with Trypanites borings growing on an older bryozoan crust GIT 819-1. Specimens oriented with aperture downwards. Scale bars 10 mm. in Conch Structures, Soft-Tissue Imprints And Taphonomy Of The Middle Ordovician Cephalopod Tragoceras Falcatum From Estonia

Text-fig. 1. Megastriae and post mortem epicoles on Tragoceras falcatum (SCHLOTHEIM, 1820). Arrows and M1–M3 indicate megastriae, bryozoan colonies are indicated by B1 and B2. a: GIT 819-1, left lateral view; b: body chamber of GIT 819-1, dorsal view; c: body chamber of GIT 819-1, left lateral view; d: GIT 819-1, right lateral view; e: PIMUZ 37299, right lateral view; f: detail of the body chamber of GIT 819-1, right lateral view, encrusted by bryozoans; g: bryozoan colony with Trypanites borings growing on an older bryozoan crust GIT 819-1. Specimens oriented with aperture downwards. Scale bars 10 mm.

opencc-by-4.0Dec 2022View details →

Text-fig. 4. Taphonomic features of the studied localities of ammonoids. a: Sandstone slab with fragmentary remains of productid and spiriferid brachiopods, orthocerids, coiled nautiloids and ammonoids (stratigraphic level No. 3). b: Shell debris cluster and fragment of crushed ammonoid conch (stratigraphic level No. 1). c: Epibionts on the surface of an ammonoid conch (stratigraphic level No. 5). d: Cluster of bivalves, gastropods and cephalopods remains in a siderite nodule (stratigraphic level No. 5). e: Fragment of an ammonoid conch (stratigraphic level No. 3). f: Fragment of an ammonoid conch (?) with terminal aperture and brachiopod valve (stratigraphic level No. 3). g: Specimen of?Anthracoceratites sp. with conch injuries (shown by arrows) (stratigraphic level No. 8). h, i: Bioerosion trace fossils Cyclopuncta girtyi ELIAS, 1958 on the fragments of cephalopod conchs (stratigraphic level No. 5). j: Limonitized conchs of the ammonoid (stratigraphic level No. 7). k: Fragment of an ammonoid conch (stratigraphic level No. 5). Scale bars 10 mm. in Late Bashkirian Ammonoids From The Mospyne Formation Of The Donets Basin, Ukraine

Text-fig. 4. Taphonomic features of the studied localities of ammonoids. a: Sandstone slab with fragmentary remains of productid and spiriferid brachiopods, orthocerids, coiled nautiloids and ammonoids (stratigraphic level No. 3). b: Shell debris cluster and fragment of crushed ammonoid conch (stratigraphic level No. 1). c: Epibionts on the surface of an ammonoid conch (stratigraphic level No. 5). d: Cluster of bivalves, gastropods and cephalopods remains in a siderite nodule (stratigraphic level No. 5). e: Fragment of an ammonoid conch (stratigraphic level No. 3). f: Fragment of an ammonoid conch (?) with terminal aperture and brachiopod valve (stratigraphic level No. 3). g: Specimen of?Anthracoceratites sp. with conch injuries (shown by arrows) (stratigraphic level No. 8). h, i: Bioerosion trace fossils Cyclopuncta girtyi ELIAS, 1958 on the fragments of cephalopod conchs (stratigraphic level No. 5). j: Limonitized conchs of the ammonoid (stratigraphic level No. 7). k: Fragment of an ammonoid conch (stratigraphic level No. 5). Scale bars 10 mm.

FIGURE 7 in New discovery of rhyncholites and conchorhynchs (cephalopod jaw elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

FIGURE 7. Conchorhynchus sp. from the Mount Laurel Formation, Delaware. A–C, AMNH 137097. D–F, AMNH 137101. G, K, O, AMNH 137102. H, I, J, AMNH 13710. L, M, N, AMNH 137103. Scale bar = 2 mm.

FIGURE 8 in New discovery of rhyncholites and conchorhynchs (cephalopod jaw elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

FIGURE 8. Eutrephoceras sp. from the Mount Laurel Formation, Delaware. A–C, AMNH 137092. D–F, AMNH 137093. G–I, AMNH 137094. Scale bar = 5 mm.

FIGURE 10 in New discovery of rhyncholites and conchorhynchs (cephalopod jaw elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

FIGURE 10. Results of principal component analysis using the six parameters L, W, H, Ls, Ws, Lh, and β. The original data are from preciously published papers (Till, 1909; Van Der Tuuk, 1985; Riegraf and SchmittRiegraf, 1995; Komarov, 2005a, 2005b; Košťák et al., 2010; Weaver et al., 2012)

FIGURE 9 in New discovery of rhyncholites and conchorhynchs (cephalopod jaw elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

FIGURE 9. Linear measurements of our specimens from the Mount Laurel Formation plotted together with those from the Cretaceous and Paleogene published in previous studies (Till, 1909; Van Der Tuuk, 1985;

FIGURE 6 in New discovery of rhyncholites and conchorhynchs (cephalopod jaw elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

FIGURE 6. Conchorhynchus sp. from the Mount Laurel Formation, Delaware. A–C, AMNH 137086. D, H, I, AMNH 137095. E–G, AMNH 137123. J, K, L, AMNH 137087. M, P, Q, AMNH 137096, N, O, R, AMNH 137099. S, T, U, AMNH 137098. Scale bar = 2 mm.

FIGURE 1. Locality and stratigraphy. A in New discovery of rhyncholites and conchorhynchs (cephalopod jaw elements) from the Upper Cretaceous Mount Laurel Formation of Delaware

FIGURE 1. Locality and stratigraphy. A, collection locality of rhyncholites and conchorhyncs. B, stratigraphic column of an adjacent locality including the Mount Laurel Formation from which our specimens were collected (modified after Kennedy and Cobban, 1994).