These ripples are preserved in this sandstone rock and are now lining a dry creek bed in Australian outback. But, it was around 2 billion years ago when motion of water formed these sand ripples on the bottom of a shallow sea. Note that orientation of ripples is different between sedimentary layers which indicates changes to water current direction.
A bilby! A nocturnal marsupial from Australia. They build burrows throughout their territory, which provides shelter them and for other species, and which may help them stay safe through bush fires. As marsupials, they keep their young in pouches through their development, but their pouches are reversed! The entry to the pouch is at the bottom, rather than the top. This helps keep dirt from getting into their pouch while burrowing! I just think they’re neat. :-)
[ID: an illustration of a bilby on a light gold background with banksia flowers and leaves arranged above it. The bilby is walking to the left, in profile. End.]