On February 27 over two dozen DPS members trekked to the “Waco Pit”, a former quarry below Lake Waco Dam administered by the Army Corps of Engineers. The pit had dried out nicely, so no one ended up covered in mud. Everyone enjoyed the day and found a few fossils. Highlights of the day included a beautiful shark vertebra found by Janice Cradoock. Crystal Fickel found many pyritized ammonites which she posted on the DPS Facebook Public Group page. She also posted photos of a possible jellyfish fossil found by Dana Blackburn.
- Tom Dill
Looking SW from the trail from the parking area into the “Pit”, which is actually a very nice wildlife area.
Looking SE from the trail, showing the eroding trail down into the “Pit”.
Most collectors focused on the low banks of eroding shale. The flats had fewer fossils, mostly oysters.
The walls of the “Pit” expose the Grayson Formation, also known as the Del Rio Shale, which here contains tiny ammonites and other fossils replaced by pyrite.
Janice Craddock with her shark vertebrae. She found several shark teeth also at the vicinity.
Nathan Van Vranken and another collector examining gullies in the Grayson Formation.
Crystal Fickel posted this photo of her finds of pyritized ammonites, each less than 1 cm across. The pyrite has oxidized to rusty brown hematite.
Crystal Fickel posted this photo of her finds of pyritized Mariella (formerly known as Plesioturrilites), up to 1.5 cm long. These look like snails (gastropods) but are actually ammonites (cephalopods). The Grayson Formation and Main Street in the mid-cities and Lake Texoma area contain much larger Mariella calcareous shells and casts.
Crystal Fickel posted this photo of shark teeth and an interesting trace fossil.
Crystal Fickel posted this photo of a possible jellyfish fossil found by Dana Blackburn.