Kronosaurus Korner curator Paul Stumkat said the digs, planned for May and June, would uncover fossils present in the Toolebuc formation, which he said was "quite a significant geological formation in Australia".

"What we seem to have discovered is quite a significant fish bed," he said.

Mr Stumkat said it appeared a "catastrophic environmental happening" about 200 million years ago had caused the animals to die, leaving remarkably well preserved fossils.

"This is a fossil deposit of exceptional preservation," he said.

"We've even got stomach contents."

Mr Stumkat said the finds cemented the North West as one of the world's premier fossil locations.

"To find fossils like this is fantastic," he said.

"Some of the best finds in the world are here around Richmond.

"To actually find material of this quality is quite amazing."

Members of the public are welcome on the expedition and will work alongside experts to unearth the ancient marine creatures.

Mr Stumkat said it was a remarkable opportunity for those with interest in palaentology.

"Things like this don't come around every day and it is a quite spectacular thing to be a part of," he said.

Places on the digs are limited.

Contact Kronosaurus Korner for more information.