132 CONTRIBUTIONS TO DEVONIAN PALEONTOLOGY. buli ..mi. 
outcrops arc less conspicuous in the upper part of the section than 
below the fish bed (I 1:55 C8) ai the the top of which is abit rarily drawn 
the division line bet ween the Cattaraugus and Oswayo, thufc giving to 
the Cattaraugus a thickness of 653 feet, as before stated. 
The Armenia section (1458) is made up of prevailingly red beds up 
to the base of 1 L58 B21. This is a green, coarse, heavy bedded mica! 
ceous sandstone with some plan I remains, and divided by a few shall 
bands and is 35 U'd thick. Above this to the top of the section thl 
lied- are green and <j i a \ . except zone B26, which is a soft red shale IS 
feet thick, -ituated 25 feel below the Armenia limestone lentil (1451 
\Vi\i). This gives about loo feet of gray beds below the Armenia 
limestone lentil in western Bradford County. The upper part of the 
Tioga section, I miles east of Tioga (1460 A.), shows a coarse whit] 
sandstone with angular quartz pebbles, of 20 feet thickness. ;it the top. 
This u called the Sharon conglomerate member of the Pottsville conl 
glomerate by Fuller, in the Elkland-Tioga folio. There seems no 
reason to doubt the general equivalency of the conglomerate (1451 
(';;]) with this upper /one of the Tioga section (1460A). Bui 
the correlation of the horizon of this and the immediately under! 
lying beds is in this paper made on basis of determination and nomen- 
clature already published in the Elkland Tioga folio, without attempt] 
ing t<> disCUSS the validity of that determination. On similar grounJ 
the uppermost cross-bedded sandstone of the Armenia section (1451 
B31) is called Sharon conglomerate in this paper. The Armenia lime- 
stone lentil of the Tioga Section (1460 A52) is a /one 10 feet in thick- 
ness p; feet below the sandstone and contains lis)] teeth and lumps of 
shale. A red shale zone L0 feet thick is separated from the base of the, 
latter by 30 feet of gray beds. 
On the basis of red beds and fish remains the equivalent of the Cat] 
skill of early literature might be carried down at lea.st to t he base of the 
Franklindale limestone member, 927 U'd above the base of the Gun 
Brook section; but on the basis of marine invertebrate fossils the 
Chemung formation runs up to at least /one L456A40, or to L, 750 feel 
above that base, a difference of 823 feet thickness of strata for thl 
Overlapping of these two conditions. 
This interval may be called Chemung, Cattaraugus, or transition 
beds of Chemung, Catskill, or Chemung-Catskill, according to thl 
prejudice of the authors. Whatever name is applied to the various 
parts of the sect ion it is clear t<> the paleontologist that as one passel 
from eastern Pennsylvania and New York westward across the seel 
tions, the place of first appearance of the vc<\ beds is at a later stag! 
of evolution of the faunas. In any particular locality the length of 
the interval from the first appearance of the red beds to the final 
deposition of the marine Chemung faunas was probably determined bj 
the degree of persistence with which the changed conditions marked 
