I was looking the lists of known **terrestrial** impact craters. In the small to medium size craters, I noted that I could not recognize any in which the target material consisted of unconsolidated sediments, e.g. either alluvium, quaternary terraces, or coastal plain. The know craters that are greater than 0.4 km in size all seem to be excavated in bedrock.
Is there any example of an impact crater greater than 0.5 km in size that has been formed in unconsolidated sediments like those underlying quaternary terraces, alluvial plain, deltaic, or coastal plain? What would such an impact crater in unconsolidated sand look like? Has anyone published anything either about such an impact crater or what type of feature an impact would produce in unconsolidated sediment. For example, it would be impossible for a crater the size of Barringer Crater in Arizona formed unconsolidated sediments to maintain the steep walls and deep crater that Barringer crater has. Thus, it would be impossible for a crater the size of Barringer crater to have the same form in unconsolidated coastal plain sediments that the Barringer crater exhibits in solid rock. What would a coastal plain crater look like if the depth of unconsolidated sediments exceeded the depth of the crater? (I am thinking of something way smaller than the Cheasapeake Bay crater, which because of its size, was blasted through the coastal plain sediments. Just Curious? Yours, Keith Littleton New Orleans, LA ______________________________________________ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
