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FIG. 3 in The late Givetian (Middle Devonian) ammonoid Epitornoceras Frech, 1902 from Argentina (southwestern Gondwana)
FIG. 3. — The Chavela Creek: A, B, structural cross-section of the Chavela Creek, showing the tectonic relation between the Chigua and Pircas Negras formations, and the angular unconformity from the overlying Malimán Formation (Mississippian); arrows point towards younger deposits; the white box (in A) indicates the location of pictures C and D; C, overturned psammitic beds, younger deposits towards the East; D, Ichnofossils indicating the base of beds.
FIG. 2 in The late Givetian (Middle Devonian) ammonoid Epitornoceras Frech, 1902 from Argentina (southwestern Gondwana)
FIG. 2. — Geological maps of the study area (A, B, modified from Amenábar 2009), and satellite image showing the location of the ammonoid fossils (C, from Google Earth).
Figure 13 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 13. Choctawites kentuckiensis (Miller, 1889). (a) Cross section of specimen 57a from Moorefield, Arkansas; × 2.5. (b) Cross section of specimen MB.C.25470 from Moorefield, Arkansas; × 2.5. (c) Suture line of specimen MB.C.25471 from Moorefield, Arkansas, at 14.1 mm diameter, 10.2 mm ww, 6.6 mm wh; × 5.0. (d–f) Ontogenetic development of the conch width index (ww / dm), umbilical width index (uw / dm), and WER of all available specimens (cross section (a) was produced by R. Kant; the original specimen is stored in the collections of the University of Iowa, acetate peels are stored in the collections of the GPI Tübingen).
Figure 12 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 12. Choctawites cumminsi (Hyatt, 1893) from San Saba (a–d) and the Figure 2 Ranch section (e, f). (a) Cross section of specimen 26- 13 from San Saba; × 2.5. (b) Cross section of specimen 26-2 from San Saba; × 2.5. (c) Cross section of specimen 26b from San Saba; × 2.5. (d) Cross section of specimen 26-10 from San Saba; × 2.5. (e) Cross section of specimen NPL 68499 from bed 25 (sample 00TXCU27) of Figure 2 Ranch; × 2.5. (f) Suture line of specimen NPL 68500 from bed 25 (sample 00TXCU27) of Figure 2 Ranch, at 14.4 mm diameter, 11.3 mm ww, 7.2 mm wh; × 5.0. (g–i), Ontogenetic development of the conch width index (ww / dm), umbilical width index (uw / dm), and WER of all available specimens (the cross sections of specimens (a–d) from San Saba were produced by R. Kant; the original specimens are stored in the collections of the USNM, acetate peels are stored in the collections of the GPI Tübingen).
Figure 9. Goniatites multiliratus Gordon, 1962 from the Figure 2 Ranch section, Sierra Diablo. Specimen NPL 68494 from bed 17 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 9. Goniatites multiliratus Gordon, 1962 from the Figure 2 Ranch section, Sierra Diablo. Specimen NPL 68494 from bed 17 (sample OOTXCU-25); × 2.0.
Figure 7 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 7. Girtyoceras meslerianum (Girty, 1909), conch cross sections and ontogenetic trajectories of material from the Caney Shale of Jackfork Creek near Ada, Oklahoma (a–d). (a) Specimen MB.C.25466; × 2.5. (b) Specimen MB.C.25467; × 2.5. (c) Specimen MB.C.25468; × 2.5. (d) Specimen MB.C.25469; × 2.5. (e–g), ontogenetic development of the conch width index (ww / dm), umbilical width index (uw / dm), and WER of the sectioned specimens and type material.
Figure 6 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 6. Girtyoceras meslerianum (Girty, 1909) from the Figure 2 Ranch section, Sierra Diablo. Specimen NPL 68364 from bed 17 (sample 00TXCU-25); × 4.0.
Figure 16 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 16. Suture lines of representatives of Pachylyroceras from localities in Utah, Nevada, and Texas; all × 6.0. (a) Pachylyroceras utahensis (Miller et al., 1952), specimen NPL 68561 from Skunk Spring, Utah, at 11.6 mm diameter, 8.3 mm ww, 5.6 mm wh. (b) Pachylyroceras utahensis (Miller et al., 1952), specimen MB.C.25472 from Hamilton Canyon, Nevada, at 9.3 mm ww, 6.1 mm wh. (c) Pachylyroceras cloudi (Miller and Youngquist, 1948), specimen NPL 68542 from bed 25 of the Figure 2 Ranch, Texas, at 13.2 mm ww, 8.0 mm wh.
Figure 5 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 5. Girtyoceras hamiltonense Korn and Titus, 2011 from the Figure 2 Ranch section, Sierra Diablo. Specimen NPL 68361 from bed 9 (sample 00TXCU-21b); × 2.5.
Figure 4 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 4. Descriptive terms for the conch morphology and suture lines of the ammonoids described here.
Figure 3 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 3. Global correlation chart for upper Viséan and lowest Serpukhovian ammonoid zones; after Ruzhencev and Bogoslovskaya (1971), Korn and Horn (1996), Korn et al. (2007), Korn and Kaufmann (2009) and Korn and Titus (2011).
Figure 11 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 11. Choctawites cumminsi (Hyatt, 1893) from bed 25 (sample 00TXCU-27) of the Figure 2 Ranch section; both × 2.5. (a) Specimen NPL 68497. (b) Specimen NPL 68498.
Figure 8 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 8. Goniatites eganensis Korn and Titus, 2011 from the Figure 2 Ranch section, Sierra Diablo. (a) Specimen NPL 68431 from bed 9 (sample OOTXCU-21b); × 1.0. (b) Specimen NPL 68471 from bed 9 (sample OOTXCU-21b); × 1.25. (c) Specimen NPL 68493 from bed 11 (sample OOTXCU-22); × 1.75. (d) Specimen NPL 68389 from bed 9 (sample OOTXCU-21a); × 2.5.
Figure 2 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 2. Columnar King's section on the Figure 2 Ranch, Sierra Diablo, Texas, with the position of fossil samples and proposed biostratigraphic attribution.
Figure 1 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 1. Reference map showing location of the Figure 2 Ranch King section, Sierra Diablo, Culberson County, Texas.
Figure 14 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 14. Choctawites choctawensis (Shumard, 1863). (a) Cross section of topotype USNM 119504 from Brushy Creek, Oklahoma; × 2.5 (from Gordon, 1965). (b) Cross section of specimen 71 from Ada, Oklahoma; × 2.5. (c) Cross section of specimen 26-1 from San Saba; × 2.5. (d–f), Ontogenetic development of the conch width index (ww / dm), umbilical width index (uw / dm), and whorl expansion rate (WER) of all available specimens (the cross sections of specimens (b) and (c) from Ada and San Saba were produced by R. Kant; the original specimens is stored in the collections of the USNM, acetate peels are stored in the collections of the GPI Tübingen).
Figure 15 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 15. Pachylyroceras cloudi (Miller and Youngquist, 1948) from bed 25 (sample 00TXCU-27) of the Figure 2 Ranch section; both × 2.5. (a) Specimen NPL 68540. (b) Specimen NPL 68541.
Figure 10 in Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
Figure 10. Cladogram of selected genera, represented by well-known species, of the superfamily Goniatitaceae.
Fig. 7 in Extreme abundance of ammonoids in mass accumulations from the Late Devonian of the Moroccan Anti-Atlas
Fig. 7. Ammonoid mass occurences from the different localities in the Anti Atlas ôf Morocco. A. PIMUZ 37920, concretion showing a ammonoid mass occurence and an orthocone (A1) with close up (A2) from Achguig, north east Tafilalt, lower Famennian. B. PIMUZ 37921, polished section of an ammonoid mass occurrence from Taouz, Tafilalt, lower Famennian. C. PIMUZ 37922, prepared ammonoids from an association from Madene EL Mrakib, Maider, lower Famennian. Scale bars 10 mm.
Fig. 6 in Extreme abundance of ammonoids in mass accumulations from the Late Devonian of the Moroccan Anti-Atlas
Fig. 6. Size distribution of all ammonoids in each sample. A. Number od specimens (without specimens lost in preparation) vs. size class. The size classes –20 were defined by using the logarithm of the log diameters shown in Table 5. B. The ammonoids counts plotted on a metric axis.
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