E. T. DUMBLE-NOTES ON THE TEXAS TERTIARIES. 
25 
From Houston to Spring, no cuts of any depth occur to show anything, 
but at the tank north of Spring Creek there is an excellent exposure of 
Orange Sand. From this point to Conroes the Orange Sand, with a cov¬ 
ering of brown sand, is to be found in many places. In one or two lo¬ 
calities the Orange Sand rests on a coarse white sandrock, the first ap¬ 
pearance being near the 121st mile post. Between Conroes and Willis 
the sandrock becomes more prominent, being capped in most places by 
Orange Sands, which form the surface at Willis, the wells dug there 
showing them to have a thickness of 65 feet. It was found that in places 
the Reynosa phase was clearly present in the Orange Sand, adding fresh 
reason for regarding them, as one and the same bed. 
Lapara-Lagarto Beds .—Just north of Willis we find gray and brown 
clays with calcareous concretions passing upward into a sandy shale. 
This is the sandrock previously noted, and shows cross-bedding. These 
brown clays, with calcareous concretions and siliceous pebbles, form the 
surface fof some distance, with an occasional capping of Orange Sand. 
Continuing northward, the clays appear as interbedded sand and clay, in 
which the dun clays are highly calcareous, with the lime in pockets and 
some clay pebbles or balls. The sands weather black and closely resem¬ 
ble those at Chappell Hill. The characteristics of these beds further west 
are reproduced in a measure, but here they do not seem to present that 
great variability and the sudden changes which are such prominent feat¬ 
ures in them there. The exposures are not very numerous between 
Kelly and Phelps, nor, indeed, until within a mile of Huntsville, when 
the country becomes more broken, and good exposures may be seen of 
these interbedded light colored clays and sands, resting on a sandstone. 
In and around Huntsville there are numerous exposures of these beds. 
The Sam Houston Normal College rests on a bed of Orange Sand, while 
the gully to the north shows the Lagarto Clays almost as well as at the 
type locality. 
Oakville Beds .—A little more than four miles from Huntsville, on the 
Riverside road, we find the first exposure of the Oakville beds as a cal¬ 
careous sandstone, with concretions of calcareous clay and containing an 
imprint of a palmetto. From this point to the vicinity of Riverside fre¬ 
quent exposures of this character were found, but it was not until we 
neared that place that a really compact sandstone was observed. The 
Riverside sandstones have been heretofore regarded by us as belonging 
to the Fayette sands, and were largely the cause of our early reference 
of the Fayette sands to the Grand Gulf of Hilgard, Loughridge having 
so referred these sandstones in his paper, “ Report on Cotton Produc¬ 
tion,” in the Reports of the Tenth Census. My examination of them, 
however, shows conclusively that they belong to the Oakville beds, and 
not to the Fayette. They comprise two members: A series of inter- 
