Plate II. Photographs of fossil imprints of ice crystals on flags of the
Eagle Ford. The upper rock shown in the Plate is from the south side of
Cuesta Blanca in Brewster County, Texas, and shows casts of crystals
which represent fillings of sandy mud projecting slightly down into an
underlying bed of more argillaceous material. The lower part of the
figure shows a similarly marked flag from the same formation at a point
about five miles north of the old Boquillas postoffice near Tornillo
Creek, east of the Chisos Mountains, in Texas. Here are seen the
original grooves made by the ice on a layer of muddy material later
buried. Slightly reduced.
[Illustration: PLATE II]