254 
Transactions Texas Academy op Science. 
Vaughan^ T. Wayiand. 
that he could find at Port Caddo, the writer was not able to reach a posi- 
tive conclusion, but from the sands apparently passing below other strat- 
ified clays, of Eocene type, he is inclined to believe that we have an 
instance of local unconformity in the Eocene.” P. 305. 
‘‘The reason for considering the Port Caddo section of Lignitic age is 
because Mr. Harris, in his report on the geology of southern Arkansas, 
has indicated the Lignitic-Claiborne as running to the headwaters of the 
lakes developed along the Hed river. His work was based upon both care- 
ful paleontologic work and field study.” P. 306. 
A tabulated list of plants occurring at Port Caddo Landing, Texas; 
Campbell’s Quarry, Cross Lake, La., and two miles north of Mansfield, La., 
from Lesquereux and .Knowlton, are given. 
Mr. Knowlton’s contribution consists of the list of plants above men- 
tioned in Mr. Vaughan’s paper, together with a few brief n'otes. 
406. Walcott, C. D. 
Administrative Eeport. 
(Rooks in Burnet, San Saba and Llano Counties', Texas.) 
Sixth Ann. Kept., U. S. Geol. Surv., p. 76. 1885. 
An announeement of the age of the Paleozoic rocks of Burnet, San Saba, 
and Llano counties, Texas. 
“These were found to be composed of Carboniferous, Lower Silurian, 
Upper Cambrian, and a series of strata called the Llano group, corre- 
sponding to the iG-rand Canon and Chuar groups of Northern Arizona. A 
good series of fossils was collected from the Upper Cambrian or Texas- 
Potsdam group.” P. 76. 
407. 
Correlation Papefs. Cambrian. 
(The Cambrian in Texas.) 
Bulletin U. S. Geol. Surv., No. 81. Washington, 1891. 
The Cambrian Rocks of Texas, pp. 216-219. Roemer on the Cambrian, 
pp. 216-217. Dr. B. E. Shumard on the same, p. 217. W. P. Jenney and 
Prof. J. S. Newberry, p. 218. .S. B. Buckley, p. 218. C. D. Walcott, p. 
218. Prof. T. B. Comstock, pp. 218-219. Paleontology of the Texas Cam- 
brian, pp. 234-235. Sections of Texas Cambrian, and comparison with 
Arizona, pp. 354-355. Comstock’s Classification, p. 355. Problems for 
investigation, p. 385. 
“The information in relation to the Cambrian area of Central Texas, in 
Llano county, is sufficient for most Geologic purposes, although more 
detailed information as to the horizontal distribution of the fauna and the 
.presence or absence of the Middle Cambrian fauna is desirable. The prin- 
cipal question, however, is the investigation of the supposed Cambrian in 
the vicinity of Ei Paso and the southwestern portion of the State.” P. 
385 . 
