Help with new "Holocene" crater – Additional Note

In the post Help with new "Holocene" crater, at
http://six.pairlist.net/pipermail/meteorite-list/2011-December/081906.html
the crater, which I discussed is the Corossol crater 
(50°3’N, 66°23’W) just offshore of the Sept Iles 
harbour, Gulf of St Lawrence, Canada. It is described in

Higgins, M.D., Lajeunesse, P., St-Onge, G., Locat, J., 
Duchesne, M., Ortiz, J., Sanfaçon, R., 2011. Bathymetric 
and Petrological Evidence for a Young (Pleistocene?) 
4-km Diameter Impact Crater in the Gulf of Saint 
Lawrence, Canada, 42nd Lunar and Planetary 
Science Conference, Houston, Texas.
http://www.lpi.usra.edu/meetings/lpsc2011/pdf/1504.pdf

Yours,

Paul H.