It was composed mostly of prodigious blocks of dark primordial slate, schist, and sandstone-blocks in many cases as large as 4 × 6 × 8 feet-though in several places it seemed to be carved out of a solid, uneven bed-rock of pre-Cambrian slate.
Osagai nagusia arbel primitibo ilunezko, eskistozko eta hareharrizko bloke miragarriak ziren, hainbat kasutan 4 x 6 x 8 oineko tamaina iristen zutenak;