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Wikipedia:WikiProject Geology/Recognized content
Baltic amber inclusions - Ant - About 7 mm long.
See
Featured geology pictures
for more
.
Concretions
on Bowling Balls Beach (
Mendocino County
, California) were weathered out of steeply-tilted
Cenozoic
mudstone
.
Opal from Yowah, Queensland, Australia. Length: about 20mm.
