While visiting this past October, another collector asked to point out various formations on the high wall. I hadn't thought about this for years and was no longer certain which was which. So with the help of Pat Young and Tex Gilmore, a simple reference image was developed.
|NCPC Tract 2007 Season, western wall|
Left: looking south from the Fall ramp; Right: looking North from Spring Ramp.
Tex made a couple comments:
Only in the north (VA, MD.) would the Plio-Pleistocene contact be called Moorehouse. Here it is referred as Yorktown or Croatan depending on who you read and by what criteria they use to determine age.
There is no Chowan River Formation (boulder bed) in the current mine block. It was last seen at the beginning of the NCPC tract.
The dragline now sits on the upper shell bed (Plio-Pleistocene Croatan) to remove overburden and mine phosphate.
That shell bed is immediately above where the boulder bed would be if it were present.