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Geological Survey Professional Paper 58
The Guadalupian Fauna |
PLATES — PLATE XIV.
CAPITAN FORMATION, GUADALUPE MOUNTAINS.
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SQUAMULARIA GUADALUPENSIS var. OVALIS n. var. (p. 369). | |
| FIGS. 1 and 1a. |
A large but imperfect specimen representing an unusual type. |
| 1. |
Ventral view. |
| 1a. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
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SQUAMULARIA GUADALUPENSIS var. SUBQUADRATA n. var. (p. 369). | |
| FIGS. 2 to 2b. |
A specimen representing another variety characterized by having a perceptible ventral sinus and a subquadrate shape. |
| 2. |
Ventral view. |
| 2a. |
Dorsal view. |
| 2b. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 3 to 3b. |
Another specimen with a sinus, somewhat intermediate between the foregoing and the usual type. |
| 3. |
Ventral view. |
| 3a. |
Dorsal view. |
| 3b. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
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SQUAMULARIA GUADALUPENSIS Shumard (p. 367). | |
| FIGS. 4 and 4a. |
A specimen of the usual type. |
| 4. |
Dorsal view. |
| 4a. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
| FIG. 5. |
A malformed individual. Dorsal view. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 6 to 11a. |
Specimens of diverse sizes and proportions. The original of fig. 10 is unusually transverse and that of figs. 11 and 11a unusually convex. Capitan formation, Capitan Peak (station 2926). |
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AMBOCOELIA PLANICONVEXA var. GUADALUPENSIS n. var. (p. 370). | |
| FIGS. 12 to 12b. |
A characteristic specimen. |
| 12. |
Dorsal view. |
| 12a. |
Side view in outline. |
| 12b. |
Ventral view. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 13 to 13b. |
A somewhat smaller though still representative specimen. |
| 13. |
Ventral view. |
| 13a. |
Side view in outline. |
| 13b. |
Dorsal view. The exfoliation of the shell in this, as in the preceding specimen, has brought to view more or less distinct traces of the internal structure. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 14 and 14a. |
An unusually narrow specimen which has more the configuration of Ambocoelia planiconvexa itself. |
| 14. |
Dorsal view. |
| 14a. |
Ventral view. Capitan formation, Capitan Peak (station 2926). |
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SPIRIFERINA BILLINGSI Shumard (p. 374). | |
| FIG. 15. |
Portion of the surface, X 4. Capitan formation, Capitan Peak (Station 2926). |
| FIG. 16. |
Portion of the surface of another specimen, X 4. The sculpture here is seen to be a little finer than in fig. 15. Traces of setae, not shown in the figure, are preserved along the edges of the lamellae. Capitan formation, Capitan Peak (station 2926). |
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SPIRIFERINA WELLERI n. sp. (p. 380). | |
| FIGS. 17 and 17a. |
An imperfect ventral valve. |
| 17. |
Seen from above. |
| 17a. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 18 and 18a. |
Dorsal valve. An impression from a natural mold which, as the matrix is limestone, still retains some of the shell adherent. |
| 18. |
Seen from above. |
| 18a. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 19 to 19b. |
A specimen retaining both valves in conjunction, supposed to represent a young stage of this species. |
| 19. |
Ventral view. |
| 19a. |
Side view in outline. |
| 19b. |
Posterior view. Capitan formation, Capitan Peak (station 2926). |
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SPIRIFERINA PYRAMIDALIS n. sp. (p. 378). | |
| FIGS. 20 to 20b. |
A characteristic ventral valve. |
| 20. |
Side view. |
| 20a. |
Posterior view. |
| 20b. |
Seen from above. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 21 to 21b. |
A specimen retaining both valves in place. |
| 21. |
Dorsal view. |
| 21a. |
Side view in outline. |
| 21b. |
Posterior view in outline. Capitan formation, Capitan Peak (station 2926). |
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HUSTEDIA MEEKANA Shumard (p. 394). | |
| FIGS. 22 to 22b. |
A characteristic specimen preserved in the same way as Shumard's type. The thick shell has been exfoliated so that the condition is almost that of an internal mold. |
| 22. |
Dorsal view, X 2. |
| 22a. |
Side view, X 2. |
| 22b. |
Anterior view, X 2. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 23 and 23a. |
A smaller, somewhat differently shaped specimen preserved in the same way. |
| 23. |
Dorsal view. |
| 23a. |
Same, X 2. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 24 and 24a. |
A specimen in part of which the shell is almost perfect, showing large, simple plications, and in part almost completely exfoliated, showing smaller striated plications. |
| 24. |
An oblique side view, X 2. |
| 24a. |
Anterior view, X 2. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 25 to 25c. |
A specimen in which the shell has been exfoliated little if at all. |
| 25. |
Ventral view. |
| 25a. |
Same, X 2. |
| 25b. |
Side view. |
| 25c. |
Anterior view. The plications in this case are rounder and a little lower than in the fore going specimen. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 26 and 26a. |
A small, rotund example having the shell only partly exfoliated. |
| 26. |
Ventral view. |
| 26a. |
Anterior view, X 2. Capitan formation, Capitan Peak (station 2926). |
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RICHTHOFENIA PERMIANA Shumard (p. 283). | |
| FIGS. 27 to 27d. |
A short, rapidly expanding example preserving the dorsal valve in place. Others are much more slender. |
| 27. |
Side view. |
| 27a. |
Anterior view. |
| 27b. |
Posterior view. |
| 27c. |
Lower side, showing cysts. |
| 27d. |
Upper side, showing dorsal valve. Capitan formation, Capitan Peak (station 2926). |
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| Plate XIV. (click on image for a PDF version) |
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Last Updated: 05-Dec-2008