816 FF. W. CRAGIN 
Trigonia of the section, Undulat@, a type exclusively character- 
istic of Jurassic rocks. This beautifully ornamented shell is of 
medium or smaller than medium size in the genus, ovate, strongly 
inflated, and has the partly continuous and partly tuberculated 
ribs abruptly angulated. I have named it, after Mr. Robert W. 
Goodell, Trigonia goodellt. Moreover, a careful reéxamina- 
tion of Trigonta vyschetzki, made possible by the new material 
in the Goodell collection, indicated that it belonged to the 
Clavellaté section of its genus, asection chiefly of Jurassic occur- 
rence. As Trigonia is, among lamellibranchs, relatively important 
as a means of stratigraphic diagnosis, and as none of the Malone 
fossils agreed with species known in the lower Comanche, the 
evidence from the Goodell collection has led me to refer the 
Malone fauna and formation to the Jurassic system. 
The vicinity of Malone was visited but once by the Messrs. 
Goodell (March 30, 1895), and then for only part of a day, 
their journey thither having been made from Sierra Blanca by 
wagon. 
Iam indebted tothe kindness of Mr. Robert W. Goodell for the 
use of his field notes on the Sierra Blanca region, and partic- 
ularly for those on the Malone hills, which include a section 
across the latter at a point considerably west of that at which 
Mr. R. R. Goodell collected the fossils and presenting different 
but apparently related conditions. His Malone hills notes are 
as follows: 
A careful search of the western end of the line of hills one mile N. E. of 
Malone failed to reveal any fossils. The following is a section across the 
western end of this line of hills. 
Bearing [magnetic] of line from station to beginning of section-line, 
INS FO? 13, 
Bearing [magnetic] of section-line, N. 20° E.; one-half mile from station. 
[ Malone station. | 
1) 340 feet heavily bedded limestone ; no fossils; seams of calcite abun- 
dant; dip ; labeled M. 
2) 30 feet coarse gypsum; dip 75° S. 40° W.; labeled N. 
3) 10 feet laminated gypsum; dip 75° S. 40° to 50° W.; labeled O. 
4) 50 feet red grits interspersed with seams of gypsum of various widths ; 
dip 75° S. 40° to 50° W..; labeled P. 
