USGS: Geological Survey Professional Paper 58: The Guadalupian Fauna (Plates)

Geological Survey Professional Paper 58

The Guadalupian Fauna

PLATES — PLATE XXIX.

DELAWARE MOUNTAIN FORMATION, SOUTHERN DELAWARE MOUNTAINS.

	CHONETES PERMIANUS Shumard (p. 226).
FIG. 1.	A silicified specimen showing some of the spines. Dorsal view, X 4. The roughness of the surface is due to the enlargement of slight imperfections in the silicification. Delaware Mountain formation, southern Delaware Mountains (station 2936).
FIG. 2.	A large silicified specimen. Ventral view. Delaware Mountain formation, southern Delaware Mountains (station 2936).
	STREPTORHYNCHUS PERATTENUATUM n. sp. (p. 180).
FIGS. 3 to 3c.	Specimen retaining both valves in conjunction and attached by its apex to another organism.
3.	Anterior view, X 2.
3a.	Posterior view, X 2. The specimen in this figure and the preceding one is represented in a detached condition.
3b.	Dorsal view, X 2.
3c.	Side view, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2962).
	PRODUCTUS sp. d (p. 273).
FIGS. 4 to 4b.	Ventral valve of a specimen referred to this species. The reflexed portion is part of the same valve.
4.	Seen from above.
4a.	Anterior view.
4b.	Side view. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	PRODUCTUS? PILEOLUS Shumard (p. 270).
FIG. 5.	A silicified dorsal valve. View of the interior, X 3. Delaware Mountain formation, southern Delaware Mountains (station 2969).
FIGS. 6 to 6c.	Another silicified dorsal valve.
6.	View of the exterior, X 3. The irregularities of the surface are due to chalcedonic replacement.
6a.	View of the interior showing the singular muscular imprints, X 3.
6b.	Side view in outline, X 3.
6c.	Posterior view, X 3. Delaware Mountain formation, southern Delaware Mountains (station 2969).
FIGS. 7 and 7a.	An imperfect specimen retaining both valves in conjunction.
7.	Ventral view, X 3. The surface markings are the result of chalcedonic silicification.
7a.	Side view, X 3. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	HUSTEDIA MEEKANA Shumard (p. 394).
FIG. 8.	A very young specimen. Dorsal view X 2. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	PUGNAX? BISULCATA var. SEMINULOIDES n. var.? (p. 312).
FIG. 9.	Posterior portion of a dorsal valve. Interior view, X 2, showing the character of the hinge plate. The crura are broken off. Different individuals show slight modifications of this structure. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	HETERELASMA SHUMARDIANUM n. sp.? (p. 338).
FIG. 10.	A silicified dorsal valve whose specific position is somewhat doubtful. View of the interior, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	NUCULA sp. c (p. 421).
FIG. 11.	An imperfect left valve. Side view, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	PROTRETE TEXANA n. sp. (p. 448).
FIGS. 12 and 12a.	A specimen retaining both valves in conjunction.
12.	Side view, X 2.
12a.	Anterior view, X 4, showing the small opening just below the beaks. Delaware Mountain formation, southern Delaware Mountains (station 2969).
FIG. 13.	A fragmentary left valve. View of the interior, X 2. The ligamental groove shows above, and at the front the channel of the little anterior aperture. Delaware Mountain formation, southern Delaware Mountains (station 2969)
	PTERIA RICHARDSONI n. sp. (p. 427).
FIG. 14.	A fairly perfect left valve. Side view, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	MYALINA SQUAMOSA Sowerby? (p. 429).
FIG. 15.	A silicified left valve preserving the surface. Side view, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	BELLEHOPHON CRASSUS Meek and Worthen (p. 479).
FIG. 16.	The least imperfect specimen found. Apertural view. Delaware Mountain formation, southern Delaware Mountains (station 2935).
	PLEUROTOMARIA TEXANA n. sp. (p. 471).
FIGS. 17 to 17c.	A nearly perfect silicified specimen.
17.	Side view, showing aperture, X 3.
17a.	Side view, X 3.
17b.	View from above, X 3.
17c.	View from below, X 3. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	PLEUROTOMARIA? ELDERI n. sp. (p. 476).
FIG. 18.	A silicified specimen selected as the type. Side view, X 3. Delaware Mountain formation, southern Delaware Mountains (station 2969?).
	PLEUROTOMARIA? CARINIFERA var. (p. 476).
FIG. 19.	A fragmentary specimen. Side view, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2964).
	MURCHISONIA? sp. a (p. 478).
FIG. 20.	An undetermined fragment. Side view, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	CYMATOCHITON? TEXANUS n. sp. (p. 451).
FIGS. 21 and 21a.	One of the valves.
21.	Seen from above.
21a.	Side view in outline. Delaware Mountain formation, southern Delaware Mountains (station 2969).
	GASTRIOCERAS sp. (p. 500).
FIGS. 22 and 22a.	A considerably eroded specimen.
22.	Side view.
22a.	Portion of the ventral surface. Delaware Mountain formation, southern Delaware Mountains (station 2968).
	WAAGENOCERAS CUMMINSI var. GUADALUPENSE n. var. (p. 502).
FIG. 23.	A medium-sized but eroded and flattened specimen.
	Side view, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2965).
FIGS. 24 and 24a.	A small specimen.
24.	Suture line, X 2.
24a.	Front view in outline, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2965).
FIGS. 25 and 25a.	A young specimen.
25.	Side view, X 2.
25a.	Suture line, X 2. This appears to be less mature than the suture from 24, which was of about the same stage or smaller. Possibly a slight amount of erosion has served to decrease the depth of the convolutions. Delaware Mountain formation, southern Delaware Mountains (station 2965).
FIG. 26.	Another specimen.
	View of the inner side of a fragment showing the internal sutures, X 2. Delaware Mountain formation, southern Delaware Mountains (station 2965).

Plate XXIX. (click on image for a PDF version)

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Last Updated: 05-Dec-2008