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I'm trying to identify some Juglandaceae fruit he gathered at Axel Heiberg. Looks like hickory, and some may be walnuts.
And yeah, for 30 million year old nuts, they're *very* well preserved. Most are flattened by their burial, but they're not mineralized, and you can pop the two nut valves apart like you can with nuts that exist today.
Petrified trees
The sediments, are they from the impact of Hudson Bay meteorite? I think it was like 13,000 years ago that made rippled effect of bedrock eskers on the western coast of Hudson Bay, and the ejecta reached Alaska, Western NWT, this island, Axel Heiberg Island, burying everything at the same time. This would explain the rapid erosion of coastal areas of Tuktoyaktok, NWT, and Alaska. The sand would be grayish/whitish, in color, like marine sediments.