Identifier: bulletinofunited164vaug (find matches)
Title: Bulletin of the United States Geological Survey--Reconnaissance of the Rio Grande Coal Fields of Texas
Year: 1900 (1900s)
Authors: Vaughan, Thomas Wayland
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Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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n itand San Carlos arroyo being within the San Carlos Basin. It is aquestion whether this canyon has been cut by erosion or is simply acleft in the rock, but it is apparently the bed of a stream whose headwaters have been captured by San Carlos arroyo. In the middle portion of this canyon a large mass of rhyolite brecciawas found included in the pantellerite. Just beyond the western end ofthe canyon a mass of baked clay was found, but owing to the limited timeat our disposal it was impossible to decide whether the clay was or wasnot included in the pantellerite. It did not appear to be an inclusion. iBull. Geol. Soc. America, Vol. VI, April, 1895, pp. 386-387. 2Dr. C. A. White, in Bull. 82 of the U. S. Geological Survey, p. 160, although he does not state itexplicitly, evidently intends to include the Taylor (Exogyra ponderosa) marls in the Montana. Mr.E. T. Dumble, in his paper already frequently quoted, refers these beds to the Montana. U. S. GEOLOGICAL SURVEY BULLETIN NO. 164 PL. X
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ENTRANCE TO BRACKS CANYON, EASTERN END, SAN CARLOS. vAruHAN.) NOTES ON SAN CARLOS SECTIONS. 83 GEOGRAPHIC DISTRIBUTION OF QUARTZ-PANTELLERITE. From the peak (> miles west of south from Chispa one can, uponlooking east, see a very thick sheet of rock above the rocks which formthe peak. Going south along Van Horn arroyo, this sheet can betraced with the eye, and is seen to form the top of the mountain theentire distance to San Carlos. Messrs. Bassett and Chapman, whoduring the field season of 1895 made the San Carlos topographicsheet, noticed this peculiar rock, and have furnished additional obser-vations in regard to its distribution. It extends south and east of SanCarlos for many miles. (PL VIII.) As the area covered by the pan-tellerite has not been mapped geologically, it is not possible to statewhat extent of territory was originally covered by that enormous sheet,but from present knowledge it was certainly many hundred, possiblyseveral thousand, square miles. CORRELATION OF TH

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