Page 14 - dort1948

Page 9

In general, the Mint Canyon strata are

{'",ha.raoterized by a light gray color. locally tinged

with light tan. The beds vary from coarse boulder

conglomerates to fine-grained sandstones and siltstones.

The bedding is known to be irregular, with large-scale

lensing and oross-bedding 1n many p~rts of the section.
The formation 1a commonly better indurated than the

younger formations 1n the region.

In the northeastern corner, where the oldest
strata are exposed aa they rise to the east. the

sediments tend to be finer grained, thinner and more
evenly bedded. and darker 1n color. Reddish brown to

medium gray mudstones and s1ltstones are abundant. and
a tew thin beds or volcanic tuft and tufaoeous sandstones

are exposed here and there.

Fresh-water laaustrine fossils have been
reported tram s1m.1lar strata north and west or Puokett

Mesa. (~ On the basis of a southwa1"Cl appearance of
coarser tluv1at1le sediments, Jahns drew a laeustr1ne-

tluv1at11e taoies line north or the mesa. However,

based on the finding of scattered outcrops of a similar

nature south and east or the mesa, it 1s suggested that

these conglomerates interrupting the finer lake

sediments may represent the depoa1ta ot a low lakeh&ad

(3 - R.H. Jahns, op. cit.