Professional Paper - United States Geological Survey Volume 39-40 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...may be compared, but in California it is accompanied by an undescribed species that is smoother, flatter, thinner, lacks crenulations on the shoulder angles, and has more complex septa. The two species can, however, easily be distinguished from each other. Horizon and locality.--Hauerites Ashley i was found by J. P. Smith in the Upper Triassic zone of Tropites subbullattw, of Shasta County, Cal., 3 miles east of Madison's ranch, in the limestone beds on the divide between Squaw Creek and Pit River, and one-half mile north of the trail across the divide. Genus DIENERIA Hyatt and Smith, tren. nov. Type.--Dieneria Arthaberi Hyatt and Smith, sp. nov. Involute, laterally compressed, discoidal deeply embracing whorls, deeply indented by the inner volutions. Sides flattened, venter narrow, with angular margins, and without furrow or keel. Umbilicus very narrow, exposing but little of the inner whorls. Surface smooth, ornamented only with flexuous lines of growth. Septa very simple, just in the transition from goniatite to ceratitic stage. The external lobe is divided by a shallow siphonal notch; the first lateral lobe is broad, shallow, and slightly serrated: the second lateral is smaller and entire; following this the septum runs in a nearly straight line to the umbilical suture, with the auxiliary lobes indicated only by undulations. This genus resembles greatly Ambites Waagen, from which it differs in the slightly serrated first lateral lobe, which in Ambites is entire. The young are exactly like Ambites. Dieneria is known only from the Upper Triassic zone of Tropites subbutlattw, of Shasta County, Cal., where it is represented by a single species. aCephulopouen der Hallstiitter Kalke: Abhandl. K.-k. geol. Rcichtanalult, Wien, vol. 6, pt. 2, p. 527, PI. CLIX, t...