Collected papers, Band 3 |
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altonensis beak Brachiopoda Cap lime Carboniferous carina Chonetes ostiolatus Coal Measures Cokeville Conularia convex costæ Cytherella benniei Dielasma Discina distinct dorsal valve dorsal view Edmondia Euphemus Euphemus subpapillosus F. B. Weeks figs FIGURE genus Girty Goniatites Grammysia hinge line Hollina emaciata Horizon and locality.-Phosphate Idaho station 3511 Idaho station 980 Leda obesa left valve less limestone Lingula carbonaria Lingulidiscina missouriensis liræ locality.-Phosphate beds mcchesneyana minusculus Montpelier district Naticopsis nevadensis Nucula Nucula montpelierensis occidentalis October 13 Omphalotrochus ferrieri oolitic Orbiculoidea osagensis ostracods Park City formation peritreme phosphate beds phosphate fauna Plate Pleurotomaria aff plications posterior Preuss Range Productus Pugnax weeksi regularly rounded Rept right valve Schizodus ferrieri sculpture shale shape shell side view sinus slightly species spire Sublette Range surface Survey suture Swan Lake Thomas Fork district transverse U. S. Geol upper Utah ventral valve view in outline volutions W. F. Ferrier width Wyoming station Yoldia
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Seite 40 - The outline rounds out strongly on the anterior side beneath the ear and to a less degree on the posterior side. The shape of the left valve is somewhat similar to that of the right, though the anterior wing is not auricular and it has no sinus beneath it. It is more sharply defined than the posterior wing, though both are rather abruptly depressed. In most specimens the surface of both valves appears to be smooth, with no markings except very obscure growth lines. In a few, however, there are traces...
Seite 6 - RhynchoneTla closely related to the Carboniferous Pugnax utah and many specimens of apparently true Myalina, not unlike Carboniferous species. It is much less certain that the Woodside formation is not Palezoic (Permian ?)• A preliminary study of the fauna of the Woodside shows that, except that it has yielded no ammonitic forms, it does not differ materially from the fauna of the Thaynes and presents a strong contrast to the Carboniferous fauna of the Park City. Lithologically also there is a...
Seite 42 - ... costae are 21 in number. Toward the anterior side they become more closely arranged or rather, perhaps, one or two alternating ones are introduced. The anterior ear has seven or eight fine, rather closely arranged radiating costae, but there is a space between the ear and the body of the shell which is not thus ornamented. The same is true of the posterior ear, only the space is broader and the ear is sharply defined on the body of the shell by the angulation above mentioned. The posterior ear...
Seite 5 - ... quartzite, whose fauna is almost unknown, seems to show considerable modification in the Idaho sections. " In notable contrast to the Weber formation, the beds above the Park City formation show striking persistence in their main lithologic and paleontologic characters. These are the 'Permo-Carboniferous' beds of the King Survey and were divided by Boutwell in the Park City district into the Woodside, Thaynes, and Ankareh formations. It seems all but certain that the ' Permian ' of Walcott's...
Seite 5 - ... lower Productus limestone' may perhaps better be united with the Park City formation, because the fossils obtained in it indicate a certain change from the fauna of the white limestone below and an affinity with the fauna of the phosphate series above. In any event, the Weber quartzite, whose fauna is almost unknown, seems to show considerable modification in the Idaho sections. " In notable contrast to the Weber formation, the beds above the Park City formation show striking persistence in their...
Seite 42 - There is airo a concentric ornamentation of fine lirae much more crowded than the costae. These are conspicuous on the noncostate strip which defines or forms part of the posterior ear. They are present on the latter as well, and also on the anterior ear, but only traces of them can be seen crossing the body of the shell in the only specimens examined. Right valve unknown. After studying a squeeze of the holotype, there is nothing that I can add to Doctor Girty's description.
Seite 40 - s description: Shell sometimes attaining a medium or rather large size, subcircular, somewhat longer than wide; axis perpendicular to the hinge which is somewhat shorter than the width below. The convexity of both valves is about the same and rather high for the genus. In the right valve the anterior wing is depressed, sharply defined, auricular, with a deep byssal sinus. The posterior wing is small, narrowly triangular, and much depressed below the body of the shell, which arises abruptly from it....
Seite 6 - (Thaynes and Ankareh) seems to be shown by fairly satisfactory evidence — the presence of an extensive ammonite fauna of Triassic type and the practical absence of any distinctive Carboniferous forms. In advance of a detailed study of these faunas, however, it may be pointed out that above the Meekoceras beds there are zones which contain great numbers of RTiynchonella closely related to the Carboniferous Pugnax utah and many specimens of apparently true Myalina, not unlike Carboniferous species.
Seite 41 - ... approximately symmetrical. Always, however, the anterior wing is larger and more sharply defined than the posterior. In the left valve the anterior wing often descends abruptly from the general convexity. The depression of the posterior wing is more gradual, but depends on the convexity of the mesial portion, which varies in different individuals. The size of the wing is also subject to variation. No cardinal structures have been ascertained, but it is improbable that this form properly belongs...
Seite 48 - Spire high, 19 mm. in one large specimen but about 15 mm. as a rule. Umbilicus large, open. General outline conical, with sides nearly flat from apex to base. The peritreme section is approximately tetragonal, the upper and lower surfaces being more or less flat and subparallel, the inner surface nearly flat and perpendicular to them, and the outer also nearly flat, making an angle of about 60° with the base. The junction of the external and lower surfaces forms a sharp, somewhat projecting carina,...