The Skull and Dentition of a Camel from the Pleistocene of Rancho La Brea

The Skull and Dentition of a Camel from the Pleistocene of Rancho La Brea

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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. 1913 edition. Excerpt: ...are decidedly cross-bedded. Excepting a little gypsum occurring locally as veins in the clays and sands, there is no trace of calcareous or other precipitates so commonly interstratified with Cenozoic lacustral deposits in the Great Basin region. The most notable characteristic of the Manix Beds is the striking evenness, persistence, and parallelism of the individual strata. In such areas as that several miles southeast of Manix no irregularity of stratification is apparent in a view showing two to three miles of practically horizontal beds. The individual strata commonly show little lamination. The differences which distinguish different layers are principally those of slight variation in coarseness of materials or in shades of color. (See pi. 23.) The upper part of the lake-beds is usually separated from the lower by several feet of relatively coarse material, presumably indicating a short period of contraction or dessication of the lake and fluviatile deposition of coarser, more highly oxidized yellowish material. Except for this interruption the beds apparently record a period of continuous deposition. Besides the evidence afforded by the remarkably even and persistent bedding, the fine texture, and the green deoxidized condition of the sediments, further proof of the lacustral origin of the Manix Beds lies in the abundance at more than one horizon of fresh-water organisms. Fish vertebrae and four species of fresh-water mollusks occur at several horizons in the beds. Shallowness and the gradual lowering of the lake level probably explain the scarcity of marked features such as beaches, wavecut terraces and sea cliffs. A welldefined pebbly beach is, however, reported by Mr. W. L. Moody to occur west of Cave Mountain. The Manix Beds more

Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236879139
  • 9781236879134