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Re: North Horn Formation and the KT Boundary
Not only does the North Horn span the K/T, but its also damn near impossible to
locate the exact location where it does so. No iridium layer, no distinct
sedimentary change. Faunal turnover is the primary indicator, though that's
always a little bit uncertain, especially given the propensity of the North
Horn's depositional environment to shuffle things around (probably the best
explaination for the lack of iriduim, too). There's a slight color shift in the
formation, but because the actual location of the K/T within the formation
can't be pinpointed, this might not actually correspond to the boundary. The
North Horn's full of cool things, however, as is the lesser-well known Price
River Formation, thought by many previously to be fossil poor, directly under
the NH.
No ref's to back this up at the moment (all packed up, preparing to get a
house), but others have posted some. Most of this comes from my time up there
working for the USFS.
Rob
http://dinodomain.com