Stephen Marlowe, Picnic (1953)
“ Marcia screamed. "Burt—look."The rocks and rubble near the remains of the Havelock were rumbling and grinding. Burt heard a great cracking sound, like a huge dead branch breaking. The ground near the Havelock trembled and the shock of it reached them. Burt sat down hard, and he saw Joan and Marcia fall in a heap.He tried to get up, but he couldn't; the ground was still trembling. A crack appeared near the Havelock, and it crawled along the ground slowly, crookedly. It crawled at a snail's pace, less than a snail's pace—but it moved. And it grew. It was as wide as Burt's arm. Wider. It grew. ”
