372 The American Geologist. June, 1902. 
er but it is the best we have and this statement may stimulate 
a search for better. 
I suspect that in Eocene times the sea transgressed on the 
land from the southwest to the site of the present axis of Ante- 
lope valley while the main Mohave desert region was land on 
which the Rosamond series accumulated, the stratified. water- 
worn material probably in lakes. 
I wish, also, to call attention to the analogy between this 
supposed Eocene volcanic eruption, apparentiy of rhyolyte 
followed by very basic lavas, of southern California and the 
great, seemingly Eocene, volcanic series of the isthmus of 
Panama* which began with the ejection of a vast quantity of 
rhyolyte tuff (the Panama formation proper) and ended with 
dark brown basalts and allied basic lavas. 
Berkeley, Calif., Jan. 25, 1902. 
(Note.—Since writing the above I have gained access to 
a paper on the isthmus of Panama by the eminent French 
geologist, M. Marcel Bertrand, who maintains that the Pana- 
ma formation is Miocene in age and from the observations 
detailed, his position seems well sustained. ) 
THE SPECIMEN OF NEMATOPYTON IN THE NEW 
YORK STATE MUSEUM. 
By CHARLES S. PROSSER, Columbus, Ohio. 
An account of the collection of “A fossil plant from Or- 
ange county [N. Y.] by J. N. Nevius” + has just come to the 
attention of the writer. Mr. Nevius stated that he was “in- 
formed by the state geologist of the existence of a large 
fossil piant at Monroe, Orange Co., in the upper Devonian 
sandstone, which is thought to belong to the Hamilton group, 
....The plant was imbedded in the typical thin-bedded, blue 
sandstone of that region, which is extensively used for flag- 
ging. It was located in a cut which had been excavated to 
obtain flagging, on a side hill about a mile and a half north- 
ward of the village of Monroe.” = 
* Bulletin No. 5 of the Museum of Comparative Zoology, at Havard Col- 
lege. vol. xxviii. 
Bulletin of the Department of Geology, University of California, vol. ii, 
No. 8, pp. 244-247. 
+N. Y. State Museum, Fifty-second An. Rept. of the Regents 1898, vol. i, 
1900, pp. r 79-r 82, plates 1-3. 
tibid., pir 79. 
?~ 
