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Geological Survey Professional Paper 58
The Guadalupian Fauna |
PLATES — PLATE XII.
CAPITAN FORMATION, GUADALUPE MOUNTAINS.
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PRODUCTUS SEMIRETICULATUS var. CAPITANENSIS n. var. (p. 254). | |
| FIGS. 1 and 1a. |
An imperfect ventral valve of rather small size. No restoration has been made in these figures. |
| 1. |
Seen from above. |
| 1a. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
| FIG. 2. |
A somewhat imperfect dorsal valve. Visceral area. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 3 to 3b. |
A somewhat imperfect dorsal valve of the usual type. |
| 3. |
Seen from above. |
| 3a. |
Seen from the front so that the flattened visceral surface lies in the plane of sight. |
| 3b. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
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PRODUCTUS OCCIDENTALIS Newberry (p. 262). | |
| FIGS. 4 to 4c. |
A ventral valve referred to this species. |
| 4. |
Seen from above. |
| 4a. |
Posterior view. |
| 4b. |
Anterior view. |
| 4c. |
Side view. Capitan formation, Capitan Peak (station 2926). |
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PRODUCTUS PINNIFORMIS n. sp. (p. 272). | |
| FIGS. 5 to 5b. |
A specimen showing part of the ventral valve and, where it is broken away, probably part of the dorsal valve beneath. |
| 5. |
Seen from above, in outline. |
| 5a. |
Same, X 2. |
| 5b. |
Side view in outline. Capitan formation, Capitan Peak (Station 2926). |
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PRODUCTUS WAAGENIANUS n. sp. (p. 253). | |
| FIGS. 6 to 6c. |
A ventral valve. It was not possible in these figures to represent the liration as sufficiently fine. |
| 6. |
Seen from above. |
| 6a. |
Anterior view. |
| 6b. |
Posterior view. |
| 6c. |
Side view. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 7 and 7a. |
A dorsal valve. |
| 7. |
Specimen seen from above. |
| 7a. |
Side view in outline. Capitan formation, Capitan Peak (station 2926). |
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PRODUCTUS? PILEOLUS Shumard (p. 270). | |
| FIGS. 8 and 8a. |
An imperfect ventral valve largely reduced to an internal mold which shows traces of structures similar to the submarginal callosity of Marginifera. |
| 8. |
Seen from above, X 3. |
| 8a. |
Side view in outline, X 3. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 9 and 9a. |
A dorsal valve preserved almost as an external mold. |
| 9. |
Seen from above, X 3. |
| 9a. |
Side view in outline, X 3. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 10 and 10a. |
A ventral valve. |
| 10. |
Seen from above, X 3. |
| 10a. |
Side view in outline, X 3. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 11 and 11a. |
Interior of dorsal valve, showing indications of structures suggesting the submarginal ridges of Marginifera. |
| 11. |
Seen from above, X 3. |
| 11a. |
Side view, X 3. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 12 and 12a. |
A dorsal valve preserved more or less as a mold of rho outside. |
| 12. |
Seen from above, X 3. |
| 12a. |
Side view in outline, X 3. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 13 and 13a. |
A dorsal valve referred with some doubt to this species. The preservation is to some extent that of an external mold. The characters of most of the surface are external, but a band around the margin shows internal markings. |
| 13. |
Seen from above, X 3. |
| 13a. |
Side view, X 3. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 14 and 14a. |
An imperfect ventral valve. |
| 14. |
Seen from above, X 3. |
| 14a. |
Side view in outline, X 3. Capitan formation, Capitan Peak (station 2926). |
| FIGS. 15 and 15a. |
Aventral valve which shows a peculiar downward prolongation of the lateral portions of the shell, best seen in figure 15a. Traces of the same structure appear to be retained in the case of the specimen represented by figures 14 and 14a, and may have been lost from other examples. |
| 15. |
Seen from above, X 3. |
| 15a. |
Side view, X 3. Capitan formation, Capitan Peak (station 2926). |
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AULOSTEGES MEDLICOTTIANUS var. AMERICANUS n. var. (p. 278). | |
| FIGS. 16 to 16b. |
The typical and only specimen, a ventral valve. |
| 16. |
Seen from above. |
| 16a. |
Side view in outline. |
| 16b. |
Posterior view. Capitan formation, Capitan Peak (station 2926). |
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| Plate XII. (click on image for a PDF version) |
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Last Updated: 05-Dec-2008