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The Great Trough
The Geography of a Vanished World
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abundant ancient delta ancient sediments Ankylosaurus areas armoured Baculites badlands bald-cypress Black Hills body bones broad-leaved trees buried carnivores channels Chasmosaurus climate coal coastal plain collected Corythosaurus creatures cycads cypress deltaic dino Dinosaur Provincial Park dinosaurian Dromaeosaurus Dromiceiomimus Drumheller duckbilled duckbilled dinosaurs earth edge environments extinctions Fairchild Garden feet ferns floodplain floor Florida formed fossil pollen Geological Survey giant growing horned dinosaur Horseshoe Canyon Formation indicate inhabited interior sea katsura trees land layer leaves levees living lizards Louisiana mammals ments miles million years ago Montana mountains mudstones North America numbers occur Oldman Formation ostrich dinosaurs oxbow lakes prairie probably Red Deer River region remains reptiles river sands Rockies Saskatchewan saurs saurus sedi sedimentary sediments sediments deposited shallow shells silts and clays sinking skeletons skull smaller southern Alberta specimens surface swamp Swibold tiny Triceratops trough tupelo tyrannosaurs valley walls varieties western interior wetland wood