Worcester Crater in the Kasei Valles region
Worcester Crater in the Kasei Valles region
The Worcester impact crater (upper half of the image) has withstood the erosive force of the floods that formed Kasei Valles. A large part of its ejecta blanket has been eroded away, but downstream parts of it have remained almost complete. The rampart-like ejecta blanket of the crater in the foreground of the image indicates that water and ground ice were mobilised during this impact and combined with the ejecta material to form a kind of mudflow.