[meteorite-list] crater chains

From: Rothery Melvin <ann.melvin_at_meteoritecentral.com>
Date: Thu Apr 22 10:08:24 2004
Message-ID: <3D7FB37C.417DBFB2_at_sympatico.ca>

It is purported that Manicouagan, Rochechouart, and St Martin, which
line up if the present continents are repositioned to form Pangea as it
was in the Late Triassic 214 million years ago, with the addition of Red
Wing Creek, and Obolon', based on the similarity of their respective
ages, probably form a crater chain created by a fragmented bolide, the
other pieces of which hit the Tethys sea to form craters subsequently
destroyed by subduction. Stratigraphic research has shown that the
impact triggered a powerful earthquake. Decaturville, Missouri, <300
million years old, is a little over 160 kilometres from Crooked Creek,
and the two are the only proven impact generated structures in a
700-kilometre long linear array of eight circular structures extending
from Kansas through Missouri to Illinois in the southern midcontinent
United States. Detailed scientific examination of the other six
structures is required before they can be classed as a true crater
chain.

(Spray, John G., and Kelley, Simon P., "Terrestrial multiple impact
events", Catastrophic events and mass extinctions; impacts and beyond:
July 9-12, 2000, Geozentrum, University of Vienna, Austria, Houston,
Texas: Lunar and Planetary Institute; 2000, (LPI Contribution No.1053),
pp.216-217.

David Skene-Melvin
Received on Wed 11 Sep 2002 05:19:56 PM PDT