180 The American Geologist. March,. i89i 
cality on the North Canadian or Beaver river, about longitude 
100" 12' W., where both the larger and the smaller varieties of 
Gryphcea pitcheri occur in Loup Fork Tertiary conglomerate, some 
of the specimens showing very little wear, and bearing witness to 
the former extension of the Neocomian over that region. 
Occurrences reported to me from points not far northeast of 
Tascosa, Texas, are probably referable to the Neocomian. 
I have also reconnoitred that portion of the "Cherokee Outlet" 
and " Panhandle of Texas" adjacent to the Cimarron river and 
the Panhandle extension of the Santa Fe railway southwest to the 
main Canadian. Loup Fork Tertiary sandstone, or more com- 
monly the sandy decomposition-product of the same, cloaks the 
divides and their south slopes, resting in general directly upon 
" red- beds " of almost vermilion red color and of supposed Tri- 
assic age above, and of dull, brownish red color and supposed Per- 
mian age below, the great gypsum horizon of that region ; yet the 
data in hand leave little room to doubt that lower Neocomian 
strata once prevailed from the western border of McPherson county, 
Kansas, across Ford and Kingman counties and portions of the 
Cherokee Outlet and the Public Lands, to the foundations of the 
Llano Estacado. 
By the courtesy of Prof. Hill, of the Texas geological survey, 
I have been able to traverse with him a course from Mill sap, 
Texas, to Weatherford, and thence to Granbury , and thus to 
confirm his reference in 1889,* of Nos. 5 and G of my Belvidere 
section to his Fredericksburg shale and Trinity sandstone, respec- 
tivel}'. 
The palaeontologic and lithologic identify of No. 5 of my Belvi- 
dere section with a certain, shell-conglomerate occurring at Weath- 
erford the lowest known Gryphsea-bearing horizon of Texas — is 
such as to warrant me in asserting the essential chronologic equiv- 
alency of the two horizons, t This conclusion is borne out by the 
general resemblance of the fauna of the strata a little above the 
Weatherford conglomerate to that of those similarly situated with 
reference to Belvidere No. .">. though in these there is not quite so 
close a lithologic correspondence. 
*Annual Report of the Geological Survey of Arkansas for 1888, p. 115. 
f Among other forms common to both strata. Idonearca vulgaris, not 
hitherto listed from Texas, was incidentally noticed. 
