[meteorite-list] New Paper About Bloody Creek Structure, Nova Scotia

[Paul H.]

There is a new paper about Bloody Creek structure. It is:

Spooner, I., P. Pufahl, T. Brisco, J. Morrow, 
M. Nalepa, P. Williams, and G. Stevens, 2015, The 
North structure: evidence  for a second possible 
impact event at the Bloody Creek site, Nova Scotia, 
Canada. Atlantic Geology, vol 51, pp. 44-50.
DOI: http://dx.doi.org/10.4138/atlgeol.2015.002
https://journals.lib.unb.ca/index.php/ag/issue/view/1723
https://journals.lib.unb.ca/index.php/ag/article/view/22375

“The North structure is a discontinuous, partially 
flooded elliptical basin 250 m in diameter and 
defined by arcuate scarps. It is located in Annapolis 
County, Nova Scotia, approximately 1 km north of 
the Bloody Creek structure, a possible 400 m-diameter 
elliptical impact crater.”

“What is lacking from the North and Bloody Creek 
sites is a convincing petrographic record of shock
metamorphic effects, a problem that clearly needs 
further investigation.”

“Both structures are interpreted to be post-Pliocene 
(<2.6 Ma), based on the unlikelihood of their preservation
during Cretaceous-Paleogene regional peneplanation.”

They also note that preservation of pre-Pleistocene 
saprolites beneath glacial tills as thick as 1–6 m at 
locations within 10 km of the proposed suggests that
glacial erosion processes were not uniform in the
region of both landforms. alternatively, they argued
the “…well-preserved scarps and low depth-diameter 
morphometry…” of these features “…might possibly
be the product of impact onto thin, stagnant glacial 
ice…” 14,000 to 12,000 calendar years ago.

They conclude that much work remains to be done.

Yours,

Paul H.