This is a fossil tube worm cast from a Miocene limestone deposit : Peace River, Hardee County, Bone Valley, Hawthorn Group, Florida. This is a Miocene deposit (approx. 5 to 23 million years old).
I cannot identify the exact species type this is. It is a hollow specimen that is completely mineralized. It measures approx. 3 inches in length. It has various trace fossil impressions along the outer surface.
Refer to the photos. The centimeter cube is shown for scale and is not included. You are purchasing the specimen shown.