Coral fossil or modern

[fossilnut]

For years I have wondered if the coral pieces that I have found on the North Myrtle beach area are modern day or fossil. If fossil from what time period. I have looked on the internet but have not found any clarity. I have found individual coral colonies and ones attached to various shells.   The corals are hard stony in nature and are in rounded fashion not branching. I hope that someone can answer this which i would greatly appreciate. Does modern South Carolina have native corals and if so can anyone give me a reference to them as i cannot find any information.

[Tidgy's Dad]

This may be of help. 

It seems to be recent.

http://woostergeologists.scotblogs.wooster.edu/2016/05/13/woosters-fossil-of-the-week-a-recent-sponge-boring-from-south-carolina/

and https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiU9b3uvYfYAhUhM5oKHfvDDNIQjhwIBQ&url=https%3A%2F%2Fwww.pinterest.com%2Fpin%2F532480355923597461%2F&psig=AOvVaw2sxLkFanJOu4VkRb7T3aCY&ust=1513271309732321

from Pinterest. 

[Pachy]

Modern Astrangia looks like.

[fossilnut]

Thanks to Tidgy"s Dad and Pachy for the links and information. Apparently no reef formations but just these small individual coral colonies thrive in the Gulf Stream warmer waters? i wil follow up on Astrangia thanks