The buildings seemed to have formed a temple, with three outlying edifices. Some of the obelisks must have fallen long before the dust and refuse of ages had filled the courtly halls, then tenantless. Others fell on this new stratum, and these now lie, say, ten feet higher than the floor, while a few of the taller columns lasted perhaps for another thousand years, and then they toppled over on the lonely plain with a crash unheard by a regardless world. The sand soon buried them there, and even the memory of Zoan faded away. The depth of the lake is nowhere great, and for many square miles the authors found it not more than four feet even in the channels, and many parts of the lake are mere pools joined by surface water only a few inches in depth.