	Figure 5. Erect, standing regenerated calamitean axiswith secondary roots crosscutting tidalite sediments. (A) Standing axis at Coal Systems, Inc., Lost Creek mine (T13S, R9W, Sec. 33/38, U.S. Geological Survey, Nauvoo, Alabama 7.5-ft quadrangle; Demko and Gastaldo, 1992) with secondary rooting structures indicated at arrows, originating from the nodes of the aerial axis. Scale is 10 cm(3.9 in.).
Image from... Erect Forests Are Evidence for Coseismic Base-level Changes in Pennsylvanian Cyclothems of the Black Warrior Basin, U.S.A.
Robert A. Gastaldo Department of Geology, Colby College, Waterville, Maine, U.S.A. Ivana Stevanovic¸-Walls Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, Pennsylvania, U.S.A. William N. Ware 1109 Wynterhall Land, Dunwoody, Georgia, U.S.A.

Erect Forests Are Evidence for Coseismic Base-level Changes in Pennsylvanian Cyclothems of the Black Warrior Basin, U.S.A.