44 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Pink cliffs exhibit an unusually fine section from the brown shales and 
sandstones that we took to be upper Cretaceous up to the pink-stained 
white limestones of the Eocene. The Cretaceous, outcropping abun- 
dantly on the sides of the valley by which the cliffs were approached 
from Upper Kanab, consists of brown and gray muddy sandstones and 
shales, abundantly cross-bedded. How far this formation should be 
classed as marine because some of its beds contain Ostreas, or continental 
because other beds include coal seams, remains to be determined. The 
uppermost brown beds, in the slope under the cliffs, are overlaid by about 
fifty feet of fine-grained reddish beds ; “‘reddish mud” suggests their 
original condition. These are separated from the next higher members 
of the series by a gently undulating surface of unconformity. Then 
come about twenty feet of fine cross-bedded sandstone, followed by more 
evenly bedded strata which seemed to merge upwards into a fine, evenly 
bedded or massive white sandy limestone, whose cliff face is stained a 
more or less vivid pink where the drainage from the upland washes over 
it, but which has a creamy white color in the more isolated promontories 
and pinnacles. The lacustrine origin of these beds, which contain fresh- 
water mollusks according to Howell (p. 267-274), does not seem open 
to question so far as the limestones are concerned, but several purplish 
partings, a few feet thick, occur within the limestone series, and this 
variation of the beds does not seem consistent with the theory of their 
deposition in a vast lake. The partings are not continuous, but are seen 
to thin and end as they are traced a few bundred feet along the embay- 
ment in the cliff face that we visited. Howell said of the formation in 
general: “These Tertiary ‘beds are so extremely variable in lithological 
character and thickness, that it is difficult to correlate sections, even 
when taken only a few miles apart, save in a very general way. This is 
especially noticeable in comparing sections near the western boundary 
of the system .. . while the eastern sections show more uniformity ” 
er (pe 60), 
The strata exposed in the hills near and at the divide between the 
Sevier and the Virgin are higher in the series than those in the Pink 
cliffs. Here we saw impure whitish or creamy limestones, sometimes 
evenly bedded, sometimes with wrinkled layers (as if locally disturbed 
by change of volume between unchanged under and overlying layers), 
sometimes without apparent stratification ; but the limestones are asso- 
ciated with cross-bedded sandstones, both below and above, and with 
occasional reddish beds. The cross-bedding of the sandstones occurred 
in layers usually less than a foot in thicknéss, and showed rapid varia- 
a 
