Saturday, April 13, 2013

New Albany Shale Fossil

Reading the Indiana Department Geology and Natural Resources Twenty-First Annual Report W.S. Blatchley State Geologist 1896, I came across a plate image and description of the Parenchymophycus asphalticum found in the New Albany Shale of Clark and Floyd Counties in Indiana, USA. The New Albany Shale was named by a local geologist in the 1800s named William Borden. The shale dates to the Late Devonian Period.

Below is an image of a New Albany Shale fossil that might be what is described in the 1896 Report.

On page 118, Parenchymophycus asphalticum is described as:
"Plant with band-like thallus 10 to 150 mm wide, the well preserved spongy parenchymatic cells always filled with asphaltum. The cell walls are rich in silica. Cross divisions (nodes) at regular distances divide the band into rectangular oblong pieces (internodes). The termination of the plant consists of an oval shaped bud similar to that of Fucus vesiculosus L. of the present age. The length of specimens found varied from a few centimeters to 183 cm. The cell walls of this most interesting sea plant have resisted so well the influence of decomposition that they served as a means of diffusion for fluid bitumen, which, after a long time, gave off the  volatile components and left only the hard aspaltum. All specimens show no ramification. (Pl. II, fig. 1)"


2 comments:

Dave said...

Nice pic Mike, I think that matches some similar material I found years ago at a fill site they used New Albany shale for. At least I can put a name to the fossil now.

Kentuckiana Mike said...

I wonder if the name was even valid since this source is over 100 years old?
It is neat seeing these old plates and the New Albany Shale yields few fossils.