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Re: "Meteor theory gets rocky ride from dinosaur expert"
----- Original Message -----
From: "Phil Bigelow" <email@example.com>
Sent: Friday, May 27, 2005 1:09 AM
Subject: Re: "Meteor theory gets rocky ride from dinosaur expert"
If the southern end of the seaway was closed, is there any evidence of
hypersalinity in the latest Maastrictian seaway? Reason I ask is because
most workers believe that the northern end of the seaway was already
closed off (the northern strand line is believed to have been located
somewhere around southern North Dakota).
1999 GSA National Meeting
TSUNAMIS IN SOUTH DAKOTA: TWO ASTEROID IMPACTS INFERRED FROM THE
CRETACEOUS/TERTIARY (K/T) BOUNDARY INTERVAL IN BADLANDS NATIONAL PARK
A marine K/T boundary section is exposed in several locations in the North
Unit of Badlands National Park. ..............
(4) The deformation of this zone is consistent with the idea of
impact-generated seismic energy or tsunamis advancing through the WIS. The
overlying sand and shale sequence (5) possibly represents a change in
sedimentation conditions influenced by climatic cycling in the WIS following
the K/T. Correlation of the two possible K/T impacts with the Chicxulub or
other proposed K/T impacts are unresolved at this time, although the tsunami
interpretation suggests that the second impact occurred closer to the study