W. M. Davis—Nonconformity at Rondout. 391 
deserve the name of limestones; their outcrop is very ragged 
and the Upper Shaly sometimes weathers on cleavage instead 
of on bedding planes, . 
giving a very deceptive 
appearance (as on the 
supposition that both 
these shaly deposits were 
formed ‘comparatively 
hear the old shore line, 
which retreated eastward 
changed, driving the 
Oo Ww ct 4 * 
; \ PAP SOCTe 
The Upper Pentamerus m Loi 
I s basen ta = ALO 
EIDA 
HUDSON RIVER 
divisions of the Lower 
Helderberg limestones is comparatively gradual; but an abrupt 
