Program, Abstracts, and Guidebooks - University of Minnesota Duluth

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filled with pectolite and calcite. An almost complete Sibley
section is evident along this hill. Above the limey red
mudstone, a white weathering unit which forms a steep cliff
beneath the diabase,is composed of purple mudstone overlain
by limestone Unfortunately, access to these units is
difficult,
Proceed east along Highway 11—17 to the town of Nipigon.
431 Nipigon lookout and historical marker.
STOP 14
CUESTAS
This lookout provides a panoramic view of the Nipigon—
Red Rock area. Diabase capped cuestas form high flat topped
hills in the, area. Islands in the distance are composed of
Osler basalt.
0.0 From lookout, continue east on Highway 17—11 to the 17—
11 intersection; continue on Highway 17.
69 Small outcrops of interbedded white sandstone and red sandy
mudstone are exposed in road cuts near Fire Hill.
14.0 A thick sheet of columnar—jointed diebase caps the Sibley
Group at Kama Bay.
14.5 First lookout, Kama Hill.
STOP 15
SANDY RED MUDSTONE, SIBLEY GROUP
A broad anticline of sandy red mudstone is exposed in
the prominant road cut to the north of this lookout. Sof t—
sediment deformation probably produced this structure. Three
thin diabase sheets follow bedding planes; the sills pinch
out, and locally cut across bedding at a high angle.
Proceed southeast along the highway towards the second
lookout. Kama Hill may be cut by a northeast—trending fault
system. Movement has resulted in uplifting of the west side.
Thus the sandy red mudstone north of the first lookout,
although low in the stratigraphic section, is slightly higher
in elevation than those beds described in the next stop.
This fault cuts the hill between the "anticline" and the
first lookout.
15.3 Second (southern) lookout.