[meteorite-list] Original Little Creek Structure, Louisiana, Paper Now Online

[Paul H.]

Dear Friends,

A PDF version of the original hard to find paper about the 
Little Creek Structure in LaSalle Parish, Louisiana is now 
available online for downloading for free. This paper is:

Echols, J. B., and R. P. McCulloh, 1998, Little Creek 
Structure, T9N-R2E, La Salle Parish, Louisiana. Basin 
Research Institute Bulletin. vol. 8. pp. 30-38.

http://www.scribd.com/doc/32482964/Little-Creek-Structure-LaSalle-Parish-Louisiana

The Little Creek Structure is an enigmatic polygonal structure 
that is located in La Salle Parish near the town of Little Creek, 
Louisiana.  At the surface, this structure consist of an area of 
about 8 square kilometers of Miocene and other sediments that 
have been downfaulted by about two thousand feet within a 
3.5 to 4.0 km in diameter ring fault system. The Miocene strata 
are surrounded by older Oligocene and Eocene sediments.
This structure has been explained by either 1. piracy of a 
preexisting piercement-type salt structure, 2. meteorite impact 
structure, 3. a deep-seated subsurface igneous diapirism, 4. 
or a combination of any of these and other hypotheses. The
surface expression of this structure consist of a series of
discontinuous circular ridges 

One geologist, whom I talked with about the origin of this 
feature suspects that the interior of this feature is still subsiding.

Yours,

Paul H.