Tuesday, April 11, 2006

Quartz on stone wall - from Norman Muller

Norman writes:

Attached is an image I took four to five years ago or more when you and I visited Tim in CT and saw the stone row in a swamp, among other features. This one shows the quartz cobbles placed intermittently on top of a row.

1 comment :

earth wanderer said...

Quartz=electrical conductivity? ...I have a theory.