Fossil of the Month - March 1999
Scale divisions 1 cm
This is the bryozoan Unitrypa scalaris Hall. This bryozoan formed a funnel-shaped frond; here we see the lower part of the colony, the stem as it were, broken off a short distance above the holdfast that achored the colony to the substratum. The fenestrated frond part can be seen in the top portion of the fossil. The stem is itself a substratum for another, encrusting bryozoan, Lichenalia stella Hall. There are numerous other species of bryozoa and crinoid columnal present in this small slab.
Origin: The lower surface of the Techenor Limestone (Moscow Formation, Hamilton Group, Middle Devonian) at Buffalo Creek near Marilla, Erie County, NY. It may in fact represent a remnant of the Jaycox Member of the Ludlowville Formation that adhers to the Tichenor Ls.
Page created March 16, 1999