Monday, July 18, 2011

Heliophyllum colonizing Favosites

This is an interesting piece of matrix from the Centerfield member of the Ludlowville formation that I found near East Bethany, NY. It has a rugose coral, likely Heliophyllum, that colonized a fallen branch of Favosites sp.

A closer view of the Favosites and you can see an eye and partial cephalon of a Phacops on the left side of the picture.

You can clearly see that the horn coral originates in one of the vacant cells on the branch of the Favosites. I like all the twists and turns that the calice of the Heliophyllum takes as it grew.

The Centerfield member of the Ludlowville formation represents a period of lower sedimentation, and possibly higher sea levels, which allowed the coral fauna to prosper. It corresponds to the Hungry Hollow member of the Widder formation in Canada and has been correlated to a section of the Mahantango formation, in Pennsylvania, called the Centerfield coral reef.


  1. Hello.

    I've just recently relocated to Batavia, just north of Bethany where you collected these. I've found a few Heliophyllum and a lot of Favosites just on random neighborhood rocks.

    It excites me that you've found Phacops parts! Phacops is my favorite trilobite and it's great to see it's found in this same layer. Hopefully I'll find one someday- but as you know, finding trilos is not easy.

  2. Actually I have found "whole" trilobites in that area but they are not in great condition. I've found two enrolled specimens that were crushed. I can recognize the thorax and part of the cephalon and pygidum but they are not great specimens. Head west to 18 mile creek south of Hamburg, NY and you can find plenty of good trilos in the Wanakah and Windom shales. I'd recommend joining the Penn-Dixie club as well so you can access their quarry and hunt for trilos there too.