On Sat, Jul 26, 2014 at 10:53 PM, Jack Davis <jdavi...@comcast.net> wrote:
> Magma? No, that would be too easy to recognize even for my untrained eyes. The bright stuff on top is limestone sediment, what's beneath that, I can't tell. The tunnel was carved by water. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
