Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
493
Again in this case
the shale's stratification
reflect the shape of the
kerogen. This kerogen
may have yielded somewhat
to the pressure, thus forming
the two "lobes" parallel
to the bedding. The
original piece may have
been more regular in shape.