fossil

Fenestella Bryozoan Fossil

Fenestella (class Stenolaemata)

AI-generated identification · may be incorrect

Lacy or fan-like appearance with tiny pores (fenestrules); usually preserved in limestone or shale; hardness relates to the host rock (3-4); dull luster; typically gray or tan.

Identified July 13, 2026More fossil →

Explore Fenestella Bryozoan Fossil in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Lacy or fan-like appearance with tiny pores (fenestrules); usually preserved in limestone or shale; hardness relates to the host rock (3-4); dull luster; typically gray or tan.

Formation & geological history

Formed in marine environments during the Paleozoic era (approx. 488-251 million years ago); bryozoans were colonial organisms that filtered food from water.

Uses & applications

Used primarily for scientific study, as index fossils for dating rock layers, and as collector specimens.

Geological facts

Fenestella bryozoans are often called 'lace corals' due to their appearance, though they are biologically unrelated to modern corals; they were dominant reef builders in the Carboniferous period.

Field identification & locations

Identify in the field by looking for delicate, net-like or screen-like textures on the surface of sedimentary rocks. Common in limestone outcrops worldwide.