I searched for "Gastaldo, R.A., I. Stevanovic-Walls, and W.N. Ware, 2004," to no avail.
Yet another creo who can't google.
Funny.
I just cut n paste the authors into google and here's the first hit:
Polystrate fossil - Wikipedia, the free encyclopedia
Gastaldo, R.A., I. Stevanovic-Walls, and W.N. Ware, 2004, Erect forests are evidence for coseismic base-level changes in Pennsylvanian cyclothems of the ...
en.wikipedia.org/wiki/Polystrate_fossil