Silurian Period Cystiphyllum Horn Coral

Here is a Cystiphyllum niagarense? horn coral from the Middle Silurian Period found in central Jefferson County, Kentucky. Corals like this are found in the Louisville LimestoneCyst is from the Greek kystis meaning sac, pouch or bladder. The horn coral appears to have been covered with small bubbles or sacs. You can see the small places showing the little areas on top of the horn coral.

Identification from Erwin Stumm's Silurian and Devonian Corals of the Falls of the Ohio pp. 51-52 (description) and plate 6 pp. 96-97.

Aulacophyllum Horn Coral

Here is a Devonian coral called Aulacophyllum. It was found in central Jefferson County, Kentucky. It looks pretty worn and is about 6 cm long.

Cystiphyllum Horn Coral

Cystiphyllum horn coral from the Silurian Period. It was found in central Jefferson County, Kentucky in the Louisville Limestone. One key to identifying this specimen are little circles that looks like bubbles were once there.

 Identification from Erwin Stumm's Silurian and Devonian Corals of the Falls of the Ohio pp. 51-52 (description) and plate 6 pp. 96-97.