... but it's not.

These rocks are in the sandstone at the top of a cliff at Bullimah Spur near Putty Beach, New South Wales. They're in a National Park so I couldn't bring out samples.
( If you know some geology, especially sedimentary, your assistance is requested. ) Or do I have to hand in my Amateur Geologist's Badge?

These rocks are in the sandstone at the top of a cliff at Bullimah Spur near Putty Beach, New South Wales. They're in a National Park so I couldn't bring out samples.
( If you know some geology, especially sedimentary, your assistance is requested. ) Or do I have to hand in my Amateur Geologist's Badge?