Conversation so far:
What is Home Plate during the Spirit rover mission?
An area from the peak of Husband Hill where Spirit spotted a striking formation, which was dubbed Home Plate
When did the global dust storm occur during the Spirit rover mission?
Towards the end of June 2007, Spirit saw a series of dust storms began clouding the Martian atmosphere with dust.
How did the dust storms affect the Spirit rover?
Both Spirit and Opportunity were facing the real possibility of system failure due to lack of energy.
Did either Spirit or Opportunity rovers end up experiencing a system failure during the dust storm?
No, Spirit and Opportunity were kept in hibernation in order to wait out the remainder of the storm.
What did the Spirit and Opportunity rovers find during their mission?
Spirit and Opportunity found the rocks on the plains of Gusev which were a type of basalt.
Did the Spirit and Opportunity rovers explore anything else besides the rock formations?
Spirit also logged 7.73 km (4.8 mi) of driving instead of the planned 600 m (0.4 mi), allowing more extensive geological analysis of Martian rocks and planetary surface features.

Question: What else did they find?
Self-contained rewrite: What else did the Spirit and Opportunity rovers find besides the rock formations and surface features?