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Many of the bivalves from South Dakota will fluoresce due to the replacement of the shell by calcite and chalcedony. The calcite will fluoresce from white to yellow to orange. The chalcedony usually shows up as a green fluorescence. Usually the stronger fluorescence is under long wave and is the first photo shown in the fluorescents (South Dakota) section of the web site. Chalcedony usually does not fluoresce well under long wave, but does fairly well for the fossils from this area.
The first photo of this specimen was taken under long wave fluorescent light. The replacement mineral here is calcite, as evidenced by the yellow fluorescence. Also check out other South Dakota fluorescent offerings under the Fluorescents section. Then click on the "To view specimen material from South Dakota" link. Some other normal light photos will be shown there as well.
The bivalve specimen appears to be a mussel, judging by its shape. The specimen is from the Upper Cretaceous (about 100-70 MYA).
The second photo (below) was taken under short wave light. There is a yellow fluorescence the same as with the long wave, just a little less strong. This specimen is also available in the fossil section. It will have the same item number followed by an "N."
Bivalve-mussel?
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Quantity in Basket:
None
Code: SDBV-101
Price: $5.00
Shipping Weight: 0.08 pounds
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Time: Upper Cretaceous, approximately 100-70
million years ago.
Location: Pierre Shale, South Dakota, USA
Dimensions: 1-3/4" x 7/8" x 1/2"
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