While we're on the topic of fossils, alternate worlds, and temporality ... I thought I'd share a link to this very good site focused upon Stoney Littleton, a Neolithic chambered tomb in Somerset. The entrance to the long barrow prominently displays a fossilized ammonite, while the interior is constructed of rocks replete with mineralized organisms.
What the structure's builders thought of this writing on the stones we can't know with the same certainty that surrounds a reading of Augustine on Utica beach, but we can guess (I suppose) that they found these objects to be beautiful, maybe sacred, certainly a kind of art similar to what they were attempting to accomplish in erecting such an unnecessary architecture.
Like most Neolithic sites that look like something other than an ambiguous rise of land or a flattened depression in humdrum terrain, this one owes a great deal to modern reconstruction. Its new life as a New Age pilgrimage site attests to the pull these places exert -- and to the enfolded temporalities at which they dwell.