Field Notebook: Arctic 1990a
Page 19
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Transcription
Unit #7 4°6m Paleocurrent over jm aligned plant frags - SE/NW 4 Plant locality on b.p #903, 35cm up from base. Equisium ?? Pictas commata Gingego (Hair Plants) Cowen (alternate needle) Assorted items Amber Fossil on a b.p. of carbonaceous both up large branch fragments PIMAG ECS-12 60cm up fur base of ss. of a ss, medium tan thin beds - (8-20cm) ripple cross laminated fusing up to dense currentwave siltstone. Thin grey mudstone (was 10cm) partings define 10 cycles in 0-50cm large symmetrical mega-ripples amplitude = 60-90cm, west to east (3 sets of these which occur at the tops of the cycle - represent reworking by a large storm event - OR, submarine counter currents. Note - large mega-ripple crest