Palæontology, Band 1Caxton Press of Sherman & Company, 1864 - 299 Seiten |
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acute AMMONITES angle anteriorly Aperture basal margin beaks beaks small body whorl branches broad broadly rounded Butte County canal Chico Creek Clayton collected by Dr columella compressed concave convex Cottonwood Creek crenulated Cretaceous CRIOCERAS curved diameter dorsum Figure flattened fossils FUSULINA Gabb genus Geological Survey hinge HORNII inch incrusted inner lip interspaces irregular length lines of growth Locality Lunule marked by numerous Martiñez Mathewson MATHEWSONII Meek middle moderately Mount Diablo n. s. Pl narrow Natural natural size nearly straight outer lip Pence's Ranch Placer County PLATE posterior end posteriorly prominent regularly convex regularly rounded REMONDII revolving lines right valve robust saddle San Diego Septum Shasta County SHELL elongated SHELL small side single specimen Siskiyou Mountains species spire high striæ subquadrate Surface marked Surface ornamented Survey of California suture Tehama County Téjon Texas Flat tubercles Tuscan Springs umbilicus umbonal ventral volution whorls five whorls six
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Seite v - Palaeontology, Vol. 1. Carboniferous and Jurassic fossils, by FB Meek. Triassic and Cretaceous fossils ; by WM Gabb. Philadelphia, 1864. xx and 243 pp.
Seite 152 - 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 199 - ... 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 xix - ... 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 165 - ... 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 xx - 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 190 - ... 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 192 - 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 x - 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 xix - 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...