Colonial Horn Coral

Phillipsastrea woodmani odd enough this is a colonial horn coral. Tie with Aulopora sp. for the most common colonial coral in the site. Often easily overlooked when covered with a lot of shale, I have to look for hints of its to uncover it. The leftmost specimen was found on the ground in a least visited part of the quarry and thus had been completely washed off of all shale by the Iowan weather.