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Seite 31
... convex and marked by prominent radiating ribs , while the right was nearly flat , with sculpture almost obsolete and of a dif- ferent character from that of the opposite valve . The right valve also had a deep byssal sinus under the ...
... convex and marked by prominent radiating ribs , while the right was nearly flat , with sculpture almost obsolete and of a dif- ferent character from that of the opposite valve . The right valve also had a deep byssal sinus under the ...
Seite 34
... convex , sharply curved below , and merging with the anterior outline , which is nearly straight . It is seldom possible to get a true outline of specimens near the beak , but the anterior rim seems to 34 FAUNA OF THE CANEY SHALE .
... convex , sharply curved below , and merging with the anterior outline , which is nearly straight . It is seldom possible to get a true outline of specimens near the beak , but the anterior rim seems to 34 FAUNA OF THE CANEY SHALE .
Seite 37
... convex , leaving , with the cognate valve , a rather large opening for the byssus . Surface marked by rather fine , indistinct , regular , concentric un- dulations and by larger ones at somewhat distant intervals . There are also rather ...
... convex , leaving , with the cognate valve , a rather large opening for the byssus . Surface marked by rather fine , indistinct , regular , concentric un- dulations and by larger ones at somewhat distant intervals . There are also rather ...
Seite 39
... convex , curving upward somewhat suddenly in front and apparently somewhat re- tracted as it meets the hinge line . Beak moderately prominent and situated a short distance back from the anterior margin . Umbonal ridge well up toward the ...
... convex , curving upward somewhat suddenly in front and apparently somewhat re- tracted as it meets the hinge line . Beak moderately prominent and situated a short distance back from the anterior margin . Umbonal ridge well up toward the ...
Seite 40
... convex , and in the same specimen about 20 mm . long . The inferior - anterior and the superior - posterior angles , therefore , are acute , and the anterior - superior angle is obtuse . The surface is marked by a considerable number of ...
... convex , and in the same specimen about 20 mm . long . The inferior - anterior and the superior - posterior angles , therefore , are acute , and the anterior - superior angle is obtuse . The surface is marked by a considerable number of ...
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Häufige Begriffe und Wortgruppen
ACTINOCERAS Adelphoceras angular Antlers quadrangle station appears Arbuckle region Atoka quadrangle station Bactrites batesvillensis belong Caney shale Caneyella Carboniferous characters chert convex costæ Deltopecten Devonian diameter dorsal valve flattened fossils G. H. Girty Gastrioceras caneyanum genus Glyphioceras Goniatites hinge line Horizon and locality.-Caney J. A. Taff Jackfork lamellæ lateral saddle left valve less limestone Lingula Lingulidiscina Liorhynchus liræ locality.-Caney shale lower Woodford margin mature McAlester quadrangle station Moorefield narrow NATICOPSIS nearly newberryi occur Orbiculoidea Original of figure Orthoceras Ouachita Mountain Ouachita region Plate plications portion posterior probably quadrangle station 2082 radial resembles revolving right valve rounded sculpture seems septa shape shell showing Side view sinus siphonal saddle siphuncle smithianus smooth Standley striæ strongly surface is marked suture tion Tishomingo quadrangle station TRIZONOCERAS Tuskahoma Tuskahoma quadrangle typical specimen umbilicus umbonal upper Mississippian ventral surface ventral valve Ventral view volutions wapanuckensis width Woodford young specimen
Beliebte Passagen
Seite 56 - Gastrioceras richardsonianum is by no means a typical representative of the genus, and I have been in some doubt as to whether it should be placed in Gastrioceras at all, rather than in Goniatites ss It is narrower than the typical species of the genus, with a more highly arched venter and a narrower umbilicus, and it lacks the characteristic lateral nodes. Except for the umbilicus, which is somewhat...
Seite 8 - Asterocalamites scrobirulatus and the single minute fern pinnule, is more or less macerated and obscure, the collection consisting chiefly of drift-rounded or comminuted and more or less macerated bits of stems roots, and bark, of no value except as showing that they fall within the epoch of vascular or woody plants (post-Silurian). The material is not of a nature or state of preservation to justify anything like a close correlation. The plant beds are Carboniferous. It is probable that they belong...
Seite 19 - Orbiculoidea appears to be that, so called, of residues, a system open to serious objection, and much more frequently found in use among botanists than zoologists. I believe that the rule among the latter, °Geol. Survey New York, Pal., vol. 8, pt. 1, 1892, p. 160. that unless a genotype is selected by the author the first-named species shall be employed, is far preferable, and I propose to apply it in this case.
Seite 66 - The direction of these lines is sinuous — concave over the ventral portion, then convex, with another reentrant curve half way toward the umbilicus. The venter, which is almost free from transverse costae, is crossed by extremely fine, delicate revolving striae, so faint that they might readily be overlooked even with a moderately strong hand lens. These revolving striae are continued laterally until they become implicated with the transverse wrinkles or plications, to which, however, they are...
Seite 5 - ... the problems presented by the Caney shale are peculiarly baffling. They involve two distinct areas in Oklahoma, and in their relations to other regions ramify extensively. The Caney shale occurs in numerous exposures through the Arbuckle and Ouachita mountains, in the central parts of the Choctaw and Chickasaw nations, respectively. It consists of black and blue argillites with local sandy strata in the upper part, and has a maximum thickness of more than 1,000 feet. While most of the Caney is...
Seite 13 - Prominent among the classes of organisms which are omitted are the plants, of which there are sometimes abundant though ill-preserved vestiges. These oftenest take the shape of impressions or replacements of wood or stems, and they frequently occur in immediate association with the goniatites and other cephalopods. Another neglected type is the fishes, represented not only by teeth but by what appear to be fragments of bone. In this connection may be mentioned agglomerations of organic fragments,...
Seite 18 - The method here employed of determining the generic content of Orbiculoidea appears to be that so called, of residues, a system open to serious objection, and much more frequently found in use among botanists than zoologists. I believe that the rule among the latter, that unless a genotype is selected by the author the first-named species 'Pal. NY, Vol. VIII, pt. I, p. 126, fn and p. 178. shall be employed is far preferable, and I propose to apply it in this case.
Seite 44 - Shell rather small, long, and very gradually tapering. The type specimen has a length of 52 mm., with a diameter above of 5£ mm. and below of 4 mm. The section is circular and the siphuncle central. The septa are moderately far apart, the interseptal distance at any point being to the diameter about as 1 to 1|, varying almost to the ratio of 1 to 2 in young specimens. The largest specimen observed has a diameter of 12 mm. The surface is apparently entirely smooth. This species rather closely resembles...
Seite 22 - ... is described as subcircular or longitudinally elliptical, and this specimen closely resembles Weller's type specimen, as shown by his figures. The only difference which I am able to point out is that the apex is a trifle more centrally situated than in the type. Weller states that L.