Palæontology ..., Band 1

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Caxton Press of Sherman & Company, 1864
 

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Seite iii - Palaeontology, Vol. 1. Carboniferous and Jurassic fossils, by FB Meek. Triassic and Cretaceous fossils ; by WM Gabb. Philadelphia, 1864. xx and 243 pp.
Seite 150 - Shell small, thick, very convex, equivalve, somewhat inequilateral ; beaks prominent, broad, strongly incurved and inclined forward. Anterior end sloping downwards ; abruptly and regularly rounded below ; posterior obliquely truncated and biangular; a distinct umbonal ridge passes from the beaks to the posterior angle in both valves. Basal margin of right valve regularly and broadly convex, straight on the left.
Seite 197 - ... fig. 1. Gabb's original description is as follows: "Shell thick, subglobose, equivalve and nearly equilateral ; beaks large, incurved, central, approximate, with sides sloping downward, anterior and basal margins regularly rounded ; posterior end rounded, or subtruncate, surface marked by 36 to 40 radiating ribs, very regular in size, a little the smallest anteriorly and obsolete behind; a faint depression usually exists on the posterior side of the umbones, which passes down and strikes the...
Seite xvii - ... called the Humboldt ranges, and from localities in Plumas county, California. But sufficient paleontological evidence has been obtained to enable us to state that this formation extends from Mexico to British Columbia, occupying a vast area, although much broken up, interrupted, and covered by volcanic and eruptive rocks, and usually highly metamorphosed.
Seite 163 - ... convexly towards the posterior end, which is subtruncated. Surface marked by small lamelliform ribs, separated by spaces about equal to four times the thickness of the ribs themselves ; the interspaces are sometimes plain, sometimes striated. Inner margin plain. Localities : Abundant near Fort Tejon, whence it was described by Mr. Conrad : also found not rarely, near Martinez, and nearly everywhere in Division B. This is the largest species of the genus, and one of the commonest fossils in California....
Seite xviii - Triassic age, with a comparatively small development of carbonifère us limestone, and that these two formations are so folded together, broken up, and metamorphosed in the great chain of the Sierra Nevada, that it will be an immense labor, if indeed possible at all, to unravel its detailed structure. While we are fully justified in saying that a large portion of the auriferous rocks of California consist of...
Seite 188 - ... Pal. Cal. Vol. 1, p. 188, pi. 25, fig. 176, 1863. Whiteaves Mesozoic Fossils, Vol. 1, p. 161, pi. 18, fig. 7, 1876. Gabb originally described this species as follows : Shell elongate, subquadrate, narrowest behind; beaks anterior, not prominent, subterminal; hinge line straight, obliquely sloping; anterior end rounded, base convex in front, straight and sloping upwards behind, posterior end convexly subtruncated. Surface marked by two radiating grooves, one of which passes from the beaks to the...
Seite 190 - Philadelphia, 1876, p. 312. [20] Trigonia gibboniana Lea, Trans. Am. Phil. Soc. 1840, p. 255, pi. 9, fig. 7. Gabb, Pal. Cal. Vol. 1, p. 190, pi. 25, fig. 178, and pi. 31, fig. 262, 1863. Gabb described this form as follows : Shell rounded, subquadrate, compressed; beaks anterior, subterminal; cardinal and basal margins nearly parallel, the former nearly straight, the latter broadly convex; anterior end broadly rounded, straight near the beaks; posterior end truncated obliquely above, vertically below....
Seite viii - Governor, and it shall be his duty, with the aid of such assistants as he may appoint, to complete the Geological Survey of the State, and prepare a Report of said Survey for publication, and superintend the publication of the same. Such Report shall be in the form of a geological, botanical, and zoological history of the State...
Seite xvii - Hallstadt and Aussee, and the St. Cassian beds, that extremely important and highly fossiliferous division of the Alpine Trias. This great Triassic belt of the Pacific Coast has been most fully explored by the survey in the latitude of 40°, and over a width east and west of nearly four degrees of longitude (117° to 121°). It is from this region that the largest portion of the...

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