81

Southeast of Mount McAllister, Mathews (1947) has mapped a small
area of the Hasler formation, and has measured 350 feet of shale with
several beds of sandstone, 4 to 15 feet thick. Fragments of a dicotyledo-
nous leaf were found in sandstone.

Goodrich Formation

The Goodrich formation lies conformably between the Hasler, below,
and the Cruiser formation, above, and consists of 550 to 600 feet of marine
sandstone and some shale. In early reports on Pine River Valley, the
strata of the Goodrich formation were included in the Dunvegan. During
the drilling of the Commotion well the question was raised as to whether
a fault occurs between Submarine and Cruiser Mountains. This focused
attention not only on the structure of this part of the Pine River Foothills,
but on the stratigraphy as well. As investigation proceeded it soon
became evident that two sandstone units of formational rank were repre-
sented, a lower one on Submarine and a higher unit on Cruiser Mountain.
Which was the Dunvegan? The first field interpretation was to identify
the lower as Dunvegan and the upper unit as a sandstone formation in the
Upper Cretaceous Smoky group. Fossils collected by Wickenden and
Shaw, however, showed that the higher sandstone carried fossils typical
of the Dunvegan and the lower one shells related to a fauna in the upper
part of the Fort St. John group on Peace River. Consequently, the lower
sandstone could only be regarded as a formation hitherto unknown and
unnamed in the Fort St. John group. For this new formation the name
Goodrich was proposed by Wickenden and Shaw (1943).

In the southern part of the Pine River Foothills, the Goodrich form-
ation outcrops south of Young Creek; from Goodrich west to Hasler Creek;
and on high uplands from Hasler Creek west to beyond Browns Creek.
In the northern part of the same foothills, it underlies a large area between
Commotion and Hulcross Creeks; a long, narrow area north of Submarine
Mountain; and a narrow area from near the mouth of Commotion Creek
west to almost opposite the mouth of Browns Creek.

Wickenden and Shaw measured only one section in the Mount Hul-
eross-Commotion Creek map-area, that exposed on the first eastern tribu-
tary of Bowlder Creek; it comprises only a little more than the lower half
of the formation and is as follows, in descending order:

Thickness

Feet
Sandstone, light grey, fairly thin-bedded, little crossbedding.... 33
Grey sandstone, thin-bedded, becoming shaly at base........-. 24
Shaly sandstone, medium to dark grey.........-++-+sseeeeees 29
Sandstone, greenish grey, medium-grained, rather massive...... 10
Sandstone, grey, rubbly, fine-grained........--0+-0-+see reese 3

ChiicieslsochnassdodborocpooT Don oodoDOUUMUOD OC an Donn opoUG 20+
Sandstone, grey. thin-bedded.......--+--2++ees sere tree reese 9
Sandstone, grey, Massive..........--++-+ gpubaceuadsaoooudas 26
Sandstone, grey, somewhat rubbly, fine-grained............--- 8
(Crorenileaganoccasagnnosecodsoo pp ube oboODe BS ppAOHOOUReP AS M1
Sandstone, grey, fairly massive.......--+0+++eeeee eerste ees 37
Sandstone, shaly, medium grey........--++see see ee etter eee 0-8-1
Shale, medium to dark grey.........-0- cece eee eee eee eees 16
& Sandstone, grey. ....---see seer ee Dene e nee e ener e cent eee 16
Shaly sandstone and sandy shale, medium grey........----+--+ 19

Total thickness.........---seccccecccccessetees 262 +

Hasler formation, dark grey shale