Fossil Detectives Close the Case on Prehistoric Spider

Fossil Detectives Close the Case on Prehistoric Spider

Fossil Detectives Close the Case on Prehistoric Spider
Footprints by Nadia Drake, Wired News, March 27, 2014.
http://www.wired.com/2014/03/prehistoric-spider-footprints/

The papers mentioned in this article are:

Alf, R. A., 1968, A spider trackway from the Coconino
Formation, Seligman, Arizona. Bulletin of the Southern
California Academy of Sciences. vol. 67. pp. 125-128.

Sadler, C. J., 1993, Arthropod Trace Fossils from the
Permian De Chelly Sandstone, Northeastern Arizona.
Journal of Paleontology. vol. 67, no. 2, pp. 240-249.

Yours,

Paul H.