FIGURE 1 in Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA

FIGURE 1. Geography and geology at the Finis Shale outcrop, TXV-200, spillway section northeast of Jacksboro, Texas, USA. A – location of Jacksboro (Jack County), approximately 100 km northwest of Fort Worth, Texas. B – TXV-200, the horseshoe-shaped outcrop at the spillway section at Lost Creek Lake. Greyish area in the middle of the horseshoe is a bedding plane, conulariids are usually found here; numbers 1–3 refer to the numbers in the landscape photo in Figure 1C. C – landscape photo of the spillway section toward the South, view when standing on the bedding plane; 1–3 inserted to compare positions as indicated in Figure 1B, white arrows with B and C indicate the location of the sections sampled (also compare Figure 2B). D – yellowish, weathered Finis Shale. E – greyish Finis Shale. D, E – sampling transects (compare Figures 1C and 2B) were prepared to be able to collect fresh, in situ shale. F – top of the outcrop (above sampled section B) represented by the Jacksboro Limestone.