Enterolasma calculum from Lockport, NY

The Irondequoit limestone Rochester Shale fauna, that I've found, is dominated by Bryozoans and debris from Crinoids with some Brachiopods and Trilobites thrown in for good measure. I've only found two coral species so far with one being the rugose coral Enterolasma calculum. It's a small coral with linear striations running the length of the exterior.

This specimen has 22-23 septae (the radial lines inside the calice or cup).

This specimen shows a slight curvature to near the base of the corallite. This is unusual as most specimens I have found are fairly straight.

There are also 22-23 septae in the calice of this specimen too which tells me they are the same species.

Both specimens were found in the middle Silurian (Sheinwoodian stage) aged rocks of the Irondequoit limestone Rochester Shale near Lockport, NY. I based my ID of the specimens on this page from New York Paleontolgy and this page from the Primitive Worlds website.

Delthyris sulcata from Lockport, NY

Delthyris is a somewhat common brachiopod within Silurian and Devonian rocks but there are several other genera that look similar such as Kozlowskiella and Howella. The specimen below I am calling Delthyris sulcata based on the picture found on this page from the New York Paleontology website.

Pedicle valve

Anterior

Brachial valve

Posterior

Profile

The specimen above came from the Irondequoit limestone Rochester Shale near Lockport, NY. The Irondequoit limestone Rochester Shale is middle Silurian (Sheinwoodian) in age.

Atrypa reticularis from Lockport, NY

Atrypa reticularis is an ubiquitous fossil from the Silurian through the Devonian. Near Lockport, NY I found some in the Irondequoit limestone Rochester Shale. The shells are typically large but almost always flattened as though through a laundry wringer.

Here is a typical specimen with nice detail preserved but when viewed from the side it's only a millimeter or two in thickness.

The flattened nature of the shells tends to cause them to break easily so finding one this large, with only a small chip missing, is somewhat rare for the site.

The Irondequoit limestone Rochester Shale is Silurian (Sheinwoodian) in age.

Trematospira camara from Lockport, NY

A common brachiopod found in the Irondequoit limestone Rochester Shale is Trematospira camara. It's a flattened, fan shaped rhyconellind and is the thrid most common brachiopod that I've found at the site (after Atrypa and Leptaena).

Brachial valve

Anterior

Pedicle valve

Posterior

Profile

The Irondequoit limestone Rochester Shale is middle Silurian (Sheinwoodian). The specimen above was found near Lockport, NY.  My ID is based on this page from the New York Paleontology web site.

Dictyonella reticulata from Lockport, NY

A well known fossil from the middle Silurian is Dictyonella. Those from the Rochester shale are called Dictyonella corallifera while those from the Waldron shale are called Dictyonella reticulata. The specimen below is from the Irondequoit limestone Rochester Shale so I'm calling it Dictyonella corallifera. It was found near Lockport, NY and it's age is 427mya (Sheinwoodian stage).

As you can tell the most obvious feature is the shell ornamentation. It's the only brachiopod that I have found with such a complex pattern.

It almost looks like a Bryozoan is coating the shell. I wonder what advantage the ornamentation would have given the brachiopod or was it just a evolutionary dead end?