Palæontology, Band 1

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Caxton Press of Sherman & Company, 1864 - 299 Seiten
 

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Seite viii - Geologist, whose duty it shall be, with the aid of such assistants as he may appoint, to make an accurate and complete geological survey of the State, and to furnish in his report of the same proper maps and diagrams thereof, with a full and scientific description of its rocks, fossils, soils and minerals, and of its botanical and zoological productions...
Seite iii - Geological Survey of California ; JD WHITNEY, State Geologist. — PALEONTOLOGY, Volume I: Carboniferous and Jurassic fossils, by F. B. MEEK; Triassic and Cretaceous Fossils, by WM GABB.
Seite xvii - Pluroas 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. Among the specimens from the Humboldt and Flumas county, Mr.
Seite xviii - ... that all, or even a portion, of the auriferous rocks are older than the Carboniferous, not a trace of a Devonian or Silurian fossil ever having been discovered in California, or indeed anywhere to the west of the 116th meridian.
Seite xviii - Carboniferous 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 165 - ... beaks ; cardinal margin sloping very 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...
Seite 190 - ... Figure 4 Trigonia tryoniana Gabb, 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...
Seite xvii - Hallatadt 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 fossils have been obtained, both from the three parallel ranges in longitude 117° to 118° called the Humboldt Ranges,...
Seite viii - He shall be commissioned by the 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 215 - Kept, pt. 1, p. 1044, pi. 66, fig. 3. "Shell elongated, tapering, scaliform; whorls numerous, sloping, straight, or somewhat concavely outwards above, angulated and obliquely truncated below" ; suture impressed and carinated by a small tubercular spiral rib. "Surface marked by numerous fine, revolving thread-like lines, sometimes alternating in size, and on the angle near the lower margin of the whorl, by coarse granulations. Aperture subquadrate.

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