Exploration of the Red River of Louisiana, in the year 1852 / by Randolph B. Marcy ; assisted by George B. McClellan. Page: 199 of 368
xv, 286 p., [65] p. of plates (1 fold.) : ill., maps ; 24 cm.View a full description of this book.
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APPENDIX E.--PAL2EONTOLOGY.
183
AMMONITES VESPERTINUS, Morton.
Ammonites vespertinus, Morton, Synopsis Cretaceous Group U. S.,
40, pl. xvii, fig. 1. Id., D'Orbigny, Prodrome de Paleont. II, 212.
Shell large, volutions about three; vertical section sub-quadrangular;
ribs prominent, each garnished with three nodules, dorsal one most
prominent; dorsal margin furnished with a prominent rounded carina.
This is the largest species of Ammonite that has hitherto been found
in the United States. In the cretaceous strata near Fort Washita,
specimens were found to measure nearly three feet in diameter, and
estimated to weigh upwards of two hundred pounds. It is quite common.
The fragment described by Dr. Morton was obtained from the
plains of Kiamesha, Arkansas.
AMMONITES MARCIANA, Shumard.
PALEONTOLOGY, P1. 4, fig. 5.
Shell compressed, not carinated, with about twelve simple, prominent
rounded ribs, which cross the dorsum and sides of the last volution
obliquely, without interruption; dorsum convex, whorls compressed;
surface smooth in the intervals between the ribs; aperture longitudinal,
sub-oval.
Length of last whorl 11 lines, width of do. 4j lines; width of umbilicus
3 lines.
The specimen figured is a cast, and the character of the lobes of the
chambers cannot be made out.
Occurs in the cretaceous strata of Cross-Timbers, Texas.
AMMONITES ACUTO-CARINATUS, Shumard.
PALLEONTOLOGY, P1. 1, fig. 3.
Shell much compressed, sharply carinated, ornamented with from 30
to 34 transverse ribs; ribs simple, distinctly elevated, flexuous, commencing
narrow at the umbilicus, and widening to within a short distance of
the dorsal border, where they are again somewhat contracted; dorsal
carina prominent, sharp, smooth, marked on each side by a shallow
depression; aperture elongate-cordate, lateral septa trilobate.
Diameter 2 4-10 inches; thickness of last whorl near aperture 5-10
inch.
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Marcy, Randolph Barnes. Exploration of the Red River of Louisiana, in the year 1852 / by Randolph B. Marcy ; assisted by George B. McClellan., book, 1854; Washington, DC. (https://texashistory.unt.edu/ark:/67531/metapth6105/m1/199/: accessed April 19, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Special Collections.