Red Rock Fossils with Mini "Pillow Lava" - Fort Union Formation

Or fingers? Sausges? Complex and interesting geology. Basis scoop is lots of igneous activity in past; thus the coal and in between, intact sandstone sediments with plentiful leaf fossils from the dense jungles 66 - 55 million years ago from the dino age to after the KT extinction. But no vertebrates until up Glendive way; which would be illegal to disturb anyway but ... drat.