GEOLOGY  OF  PENNSYLVANIA

 

Drake Well (Titusville, northwestern PA)

 

Coral Caverns (Manns Choice, southern PA)

 

Centralia Coal Fire (eastern PA)

 

Pioneer Tunnel Coal Mine (eastern PA)

 

Anthracite coal fields of eastern Pennsylvania

(an external photo diary of a premeeting GSA-Philadelphia field trip in October 2006)

 


 

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