Home Plate - Wow!
The layered rocks at home plate remind me of slate, where as the layered rocks Opportunity has encountered reminds me of limestone.
However, check out the laying at the bottom of this picture. It sort-of resembles the laying Opportunity has found. Looks much different from the slate-like layering.
Here is the rim of Home Plate. What is Home Plate- an old crater?
Whatever it is, I get the feeling Spirit has hit the jackpot at this location.