If the sponge broke down but the salt remained and held its shape, we would call that a permineralized fossil of the sponge. In the Kits: #4: Dinosaur bone, # 6: Petrified wood Compression - These ...

1. Identify a fossil as a sponge, archeocyathid, rugose, tabulate or scleractinian coral. 2. Know the skeletal structure and material of each of these animals. 3. Know the ecological characteristics ...

The Museum has a substantial collection of fossil sponges that contains an estimated 71,000 specimens, including more than 200 type and figured specimens. The collection also contains a number of ...

Scientists predict that sponges—among the most basic animals—arose a few hundred million years before the occurrence of the oldest confirmed fossil specimens, which date to about 500 million years ago ...