shelvin

We found him under a shelvin 'rock where he'd got by wadin' up the branch a quarter of a mile to fool the dogs.

The Leopard's Spots [selections] 1902

He had hoped that it might be possible to land them on the island, but the captain said it was out of the question; he couldn't get near enough, for one thing, and if he could, he wouldn't; for how were heavy things like them to be dumped on a shelvin 'bank like that, he'd like to know?

Eyebright A Story Susan Coolidge 1870

"'Twas now 'bout midnight, and we went back to the fire we'd built under a big shelvin '

Chains and Freedom: Or, The Life and Adventures of Peter Wheeler, a Colored Man Yet Living. A Slave in Chains, a Sailor on the Deep, and a Sinner at the Cross 1839