jurgen ostarhild
sedimentstudies lulea, sweden ( FACEBOOK server )


30 colors, server generated filenames, september 2016.
size variable


31 colors, server generated filenames, august 2016.
size variable

hommage to NICOLAS STENO (1638 - 1686 )
the law of superposition forms one of the bases of the sciences of geology, archaeology, and other fields of stratigraphy. it states that in undeformed stratigraphic sequences, the oldest strata will be at the bottom of the sequence