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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