Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
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Transcription
Aug 17, 1918.
Keppel Island - Hantles Bay.
As we go around the small side of Keppel Island towards the east
we see thin zones of laminated clay, in completely unweathered. Fossils
are accordingly very scarce.
Duntan thinks there may be upland on Keppel Island about 20
[illegible] feet of dolomite beneath the semi-cracked beds, followed by less than 50
feet of the latter. The strata are almost horizontal, though hardly they
undulate in some places with the formations all atwitter.
At 2.30 we are aboard again and start for Hantles Bay.
Duntan's notes for the afternoon areas follows:
"As we enter Hantles Bay we pass between the southern mainland
and House Island in the mouth of the Bay. This island is formed of Blue-
mountain dolomite. Its east and southwest shores expose these rocks
dipping steeply to the southeast but undulating, the dip varying within
a few yards from 35S.40E to 30 due S. The island in a "criche
monotonese". These upturned and somewhat disturbed beds of dolomite
being beveled off and glacially polished, grooved and striated. See
photo. The direction of the ice movement was N.80W. Chatter marks are developed along many of the striae.
The northern shore of the mainland about 1/2 mile from this island in a direction N.70E is
formed of Blue mountain dolomite, dipping 10N.W.-W. This promontory
is once glaciated with big garrs.
The dolomite here is darker and more coarsely crystallized
and in heavy beds, milk dolomite streaks and white mottling of the same.