24 
TRANSACTIONS OF THE TEXAS ACADEMY OF SCIENCE. 
present evidence, and a long period intervened in which the area was 
dry land. 
The succeeding deposits are sands, which in many respects closely re¬ 
semble those of the Fayette, of which the}^ have hitherto been regarded 
as a part. They differ, however, in not having the opalized wood, and 
in that the fossils in the later beds are vertebrate remains of species 
characteristic of the Loup Fork, while the shells of the Fayette are plainly 
Lower Claiborne species. These beds form the surface rocks around 
Oakville, and I have used that name to designate them. 
The Lapara beds which follow these are the coastal representative of 
the Blanco beds of the Llano Estacado, being similar in physical character 
and fossil contents. 
The Lagarto beds include a series of sands and clays of light colors 
containing considerable quantities of manganese and seamed with lime. 
The Reynosa has the widest distribution of any of the beds of the 
Neocene. It consists of beds of gravel cemented by lime, tufaceous 
limestone, and interbedded clays, limy sands and limy clays. To the 
east this is replaced by the Orange Sand phase. It forms the crests of 
the divides, and south of the great bend of the Nueces spreads out in a 
plateau closely homologous to that of the Llano Estacado. 
The Neocene deposits, as a whole, represent a period of lacustrine, 
fluviatile, and estuarine deposits, the only marine conditions of the region 
being those indicated in the Galveston Deep Well section. 
Prior to the deposition of the Equus, or basal beds of the Pleistocene, 
considerable erosion took place in the underlying Reynosa, and those 
beds were laid down in the channels thus formed. They are the direct 
correlatives of the Equus beds of the Llano Estacado, and are followed 
by the Coast Clays or Port Hudson group of Hilgard, which along the 
coast are in turn replaced by the Coast Sands. 
Such, in brief, are the different members of the Post-Cretaceous de¬ 
posits of the Coastal Slope, the details of which will be found more fully 
given in the report already referred to and in a short paper entitled 
“ The Cenozoic Deposits of Texas.”* 
A recent trip along the line of the International and Great Northern 
Railroad from Houston to Palestine gave some details which are of 
interest. 
Reynosa-Orange Sand .—At Houston we find at the surface a mottled 
sandy clay such as has, at places further -west, been taken as the base of 
the Coast Clays. It is underlaid by red and greenish clays with calcareous 
nodules and bands, and containing manganese as well as ferruginous 
pebbles. Along Buffalo Bayou and in the railroad cuts these beds are 
well exposed, and are capped in the vicinity of the bayou with sand. 
^Journal of Geology, Sept.-Oet., 1894, pp. 549-5G7. 
