GeoPic Of The Week: Fenestrate Bryozoan In Limestone

Fenestrate bryozoan in limestone

Fenestrate bryozoan in limestone

Bryozoans are colonies of tiny individuals, approximately a millimeter or less, living from tide-level to abyssal depths in today’s oceans.  They have been abundant and diverse throughout geologic time since the Ordovician Period.  Bryozoan colonies vary in shape and can be stick-like, massive, or lacy and net-like.  Lacy bryozoans are also called fenestrate bryozoans.  The lacy bryozoan in the picture is approximately 2 inches (5 cm) long and is present in Pennsylvanian age rocks in northwest Arkansas.


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