Paleontology of the Coalinga District, Fresno and Kings Counties, California

Paleontology of the Coalinga District, Fresno and Kings Counties, California

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...6. Description.--Shell attaining an altitude of 6 millimeters, globularconical, umbilicated, spirally sculptured, apex subacute. Whorls four, slightly convex, ornamented by several (five on penultimate whorl of type) prominent, regular, equidistant, rounded threadlike spiral ridges and numerous fine sharp regular equidistant incremental lines which slope obliquely downward to the right. Suture impressed, rather inconspicuous. Body whorl faintly angular, ornamented on base by five or six spiral ridges only very slightly less prominent than those on sides of whorls. Aperture rounded; lips simple; umbilicus perforate. Dimensions.--Altitude 6 mm.; latitude 6.2 mm.; altitude of body whorl 5 mm. Notes.--M. johnsoni is allied to M. jminlla Gould (Recent range Alaska to Puget Sound), but may be distinguished by its smaller size, less convex whorls, less conspicuous suture, and much coarser but fewer spiral lines on base. The species is easily distinguishable from Leptothyra by its higher spire, perforate umbilicus, and more prominent oblique incremental sculpture. Believed to be characteristic of the Jacalitos formation. It is named in honor of Mr. Harry Roland Johnson, of the U. S. Geological Survey. Type--Catalogue No. 165663, U.S.N.M. Locality.--United States Geological Survey locality 4765, on Jasper Creek just above its confluence with Jacalitos Creek, on west side of center of SW. sec. 6, T. 22 S., R. 15 E. About 2,000 feet stratigraphically below summit of formation. One of typical Jacalitos localities (Ralph Arnold). Horizon.--Jacalitos formation, lower part of upper Miocene. Genus THAIS Link. Thais Kettlemanensis n. sp. Plate XV, figure 4; Plate XXI, figures 1 and la. Description.--Shell about 85 millimeters in length, broadly fusiform...show more

Product details

  • Paperback | 54 pages
  • 189 x 246 x 3mm | 113g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236891082
  • 9781236891082