Coral or Sponge; a process of identification

Sponge or Coral (Mystery Florida Fossil)

Sponge or Coral (Mystery Florida Fossil)

I’ve been very perplexed by this Florida fossil whether it’s a coral or sponge, but my sense of curiosity doesn’t give up easily.  Follow along as I come to a conclusion as to its identity.  To begin with, the mystery fossil  possesses meandering ridges resembling the various types of brain corals, yet it is dotted with numerous protruding openings very much like the encrusting  sponge species below, also found in Florida.

Brown Encrusting Octopus Sponge Source: http://reefguide.org/carib/pixhtml/brownencrustingoctopus2.html

Brown Encrusting Octopus Sponge
Source: Wikipedia Commons

 

HPIM3716

Florida Brain Coral Fossil

 

The problem with the encrusting type of sponge is that they cover hard surfaces much the same way in which moss covers the ground.  I don’t know if this type of sponge, with its unique growth pattern, would break loose and end up on a beach where my mother-in-law, Winkie, picked it up in Florida during the 70’s and 80’s.

Rose Brain Coral Fossil

Rose Brain Coral Fossil

Pink Lumpy Sponge Source:http://commons.wikimedia.org/wiki/File:Monanchora_unguifera_(Pink_Lumpy_sponge).jpg

Pink Lumpy Sponge
Source: Wikipedia Commons

 

 

 

 

 

 

 

 

If you’ll notice, the “rose brain coral” above has a few pitted holes like the mystery fossil but not nearly as many; and if you’ll also notice, the “pink lumpy sponge” to the right possesses a pattern of ridges, but only sort of like the mystery fossil.  Hmmmm . . . a point I’d like to make for a second here, is how this demonstrates what fossil hunters do. They learn to observe things with a keener eye in order to identify their findings. Anyway, we’ve concluded our mystery fossil has similar characteristics as the above corals and sponges, but not exactly the same as any of them.

We’re on the bloodhound trail, let’s continue observing.  On the one hand, the mystery fossil is quite lighter and airier compared to the other Florida corals in my collection and it has more openings visible on all sides which leads me to think it could be a sponge. But, the patterns of ridges, plus the color, shape, and texture is quite similar to the other corals from the collection.

Christmas Tree Tube Worms Source: http://en.wikipedia.org/wiki/File:Spirobranchus_giganteus_(assorted_Christmas_tree_worms).jpg

Christmas Tree Tube Worms on Coral Source: Wikipedia Commons

 

Tube Worms On Clam

Tube Worms On Clam

 

 

 

 

 

 

 

 

So, if the mystery fossil, on most levels, appears to be a coral with the one exception of the deeply pitted holes, what could have caused those holes and why so many? Observe the Christmas tree tube worm image above. The tube worms have completely covered the top of a coral.  Could they have made the holes in question? I’ve decided not because the openings on the mystery coral look quite different from the tube worm burrowing on the clam fossil above. I’m no expert, but I decided the mystery fossil is a type of coral, likely related to the brain corals. Feel free to disagree in the comments if you know of think otherwise.

Check out the tube worms link to the right listed under CLASSIFICATIONS to learn more about them and how they can actually be quite pretty.

Advertisements

8 thoughts on “Coral or Sponge; a process of identification

  1. Found this very interesting. I think the ‘coral / sponge’ thing can sometimes be very hard to determine. That’s for an amateur. If you find it hard too, that’s is some encouragement, in a way! RH

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s