. Bulletin of the Department of Geology of the University of California. . Fossil Remains.—The fossil remains, including in part of the same age, but may have accumulated in a different basin. At Rattlesnake Creek near Cot- tonwood the Mascall is not less than 800 to [,000 feet thick. The beds are made up largely of ash and tuff and are generally light colored, though there are some brownish and reddish strata. Coarse detrital mate- rials are generally absent from the typical section on the north side of the East Fork Valley. Six miles above Dayville there are exposed along the south side of t
. Bulletin of the Department of Geology of the University of California. . Fossil Remains.—The fossil remains, including in part of the same age, but may have accumulated in a different basin. At Rattlesnake Creek near Cot- tonwood the Mascall is not less than 800 to [,000 feet thick. The beds are made up largely of ash and tuff and are generally light colored, though there are some brownish and reddish strata. Coarse detrital mate- rials are generally absent from the typical section on the north side of the East Fork Valley. Six miles above Dayville there are exposed along the south side of the valley about 400-50ofeet of conglom- erate, sand, ash, and tuff, forming a syncline pitching to the southeast. The steepest dip seen in the main section here is about 300, but at the foot of the bluff there are some exposures of gravel beds which are nearly vertical. Pebbles from several horizons in this section were exam- ined, but none seemed to be derived from the Columbia lava. Two other exposures of gravel were seen some miles west of this point, also on the south side of the river. Whether these beds are upper Mascall or whether they belong in some other formation is not clear to the writer. Fragmentary leaf remains were found about the middle of the section, and sufficient material could possibly be obtained there to throw some light upon the age of the horizon. Mascall formation has furnished many those of mammals, testudinates, fish, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of California, Berkeley. Dept. of Geology. Berkeley : The University
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