Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
Wea. TUES. FEB. 9, 1909 Ther.
is a dried bed - now red clay with Stipmaria which
are transformed into limonite. Beneath the
Stipmaria the red clay is free of green fillips
of the Stipmaria roots. On the line that
has preserved the Stipmaria. Elsewhere one
sees the outlets of Stipmaria without the Stip
maria themselves. The li, must be late
deposits, dust clear into them, and the li. pre-cipitated many things algal or other plant growth.
Have a piece, and it ought to be studied
physically and chemically, because of its desert
character. The thickness of the beds was regular
across the beach - several hundred feet across and
flat bottomed. Evidently the lakes had considerable
extent, but shallower and at first a swamp of lagoons.
On the beach slopes, at lower tide, on sand
bottom one sees a sort of current ripples, the crests
of which are are truncated. These flat tops may be
9/4 inch up to 1 1/2 inches across. The ripple bottoms
are acute and often deeper than usual. This type
of rippling is also seen in these Pennsylvania
deposits. They an indicator of very shallow water
on which the wind is flaring, and flaring.