Two sides of a Stigmaria ficoides specimen from eastern Kentucky preserved as a silty shale cast with a coalified outer rim, showing characteristic circular pits where root hairs attached and an axial depression (Ad) on one side.
Coaly Stigmaria root with lateral rootlets in claystone, Haddix coal horizon, near Hazard, Kentucky. Centimeter scale.Stigmaria in siltstone, Whitesburg coal zone, Martin County, Kentucky. Hammer for scale.Stigmaria in sandstone, from Lower Pennsylvanian strata, Greenup County. Hammer for scale.Stigmaria specimen in claystone from eastern Kentucky, showing lateral rootlets. Centimeter scale.Stigmaria cast from eastern Kentucky on display in the Department of Earth and Environmental Science at the University of Kentucky (no. N237)
