|The Obelisk was partially buried and covered with lichens when we began our investigation. Only four large theropod footprints and a few smaller prints were visible.|
Bird Tracks (A1)
|As we began to clean lichens from the
we started discovering many bird tracks.
Large Theropod (T4)
|The top photo shows two steps of a large theropod, a
right foot then a left foot. A third step in the sequence
(right foot) is broken off the main block but mostly intact.
The bottom photo show a closeup of the T4 cast area.
This specimen has an interesting chronology:
The large theropod walked through first, followed by at least one bird which left its tracks in and around the theropod track. After a long interval of burial, the fault cutting across the track most likely occured during the Black Hills uplift around 50 million years ago.
Medium-sized theropod (T3)
Medium-small theropod (T2)
Small theropod or possible hipsolophodontid (T1)
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