There were lots of sponges in the shallow warm seas of the Dinosaur Age, it has been deduced, as they were commonly caught up in the liquid ooze of silica that went on to form flint nodules, in an as yet undetermined way. In the modern world there are lots of sponges off the western coast of Australia – a garden of sponges in fact. Go to http://phys.org/print312203045.html
