Re: "Meteor theory gets rocky ride from dinosaur expert"

[jrc <jrccea@bellsouth.net>]

----- Original Message ----- 
From: "Phil Bigelow" <bigelowp@juno.com>
To: <dinosaur@usc.edu>
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 
area.