176 The American Geologist. March, lsoi 
made by himself several years ago along the northern flank of 
Pope Hollow, about one-third of a mile from its western terminus. 
Altitudes were determined by the use of a hand level, and are 
reckoned from the highway that traverses this miniature canon. 
The lower portion of the section (see PI. vi. ) could not be 
studied in a satisfactory manner owing to the general prevalence 
of soil and underbrush, together with debris from above. At this 
particular locality, too, the exact limits of the Pope Hollow con- 
o-lomerate are rendered indefinite by loose material, brush, etc. ; 
one-fourth of a mile farther west, it stands out in bold relief, with 
its upper surface 110 feet* below the summit of the slope. 
Paleontologically considered, this section admits of three sub- 
divisions (see PI. vi ). 
(1). Brachiopod Series. The various beds here included, con- 
sist of alternate layers of dark, sometimes greenish, shale, and grey- 
ish argillaceous sandstone, which show no marked change from 
a night of 160 to 285 feet above the highway. The argillaceous 
layers in particular are often literally packed with Spirifera dis- 
junctn, Rhynchonella contrdcta, together with frequent specimens 
of Chonetes scitula, Productella onusta? and occasional fragment 
of crinoid stems and Bryozoa. Only one lamellibranch was noted, 
a Nucula. 
Above these beds, rests a very fine-grained conglomerate, of 
but five feet in thickness. Its pebbles are small and clear, and 
are set in a dull, greenish, somewhat argillaceous matrix. Special 
attention is called to this bed for two reasons : (1) its position is 
such as to render it the probable representative of the "Panama 
conglomerate, and so it has been correlated on plate vi, with 
Hall's sections! at Warren and Panama. (2) it serves to mark in a 
o-eneral way, the dividing line between the Brachiopod and 
Lamellibranch series. 
(2) Lamellibranch Series. Above this conglomerate stratum, 
the dark, soft, green shales and grayish sandstone reappear, and 
continue for some distance with but slight variations. The}' con- 
tain Spirifera disjuncta and Rhynchonella contractu, though by 
*A fact courteously furnished by Prof. J. F. Carll. 
fThe Warren and Panama sections given on plate vi arc mainly 
after Hall, though the present writer has added the terms (Pope Hollow 
congl.?) and (Panama congl.) to the former, and has given the Panama 
conglomerate and its overlying beds in a diagrammatic form. See Proc. 
A. A. A. S., XXXiii, 1884, pp. 416-419. 
