News Penny Hoffmann Premium Content Subscriber only In the late 1800s, excavations via pick and shovel began on the Mount Morgan fireclay caverns to provide for the town’s brickworks. But what workers didn’t know at the time was that they were excavating what was once a Jurassic lake. The clay mining ceased in 1927 and over a number of years, clay fell from the cavern’s ceilings, uncovering hundreds of unexpected dinosaur footprints that palaeontologists have estimated to be over 200 million years old. The footprints were first discovered by a survey team in 1952 and were later analysed by geologist.