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Septarian Nodule
Images: 
By DPS Ammonite
Taxonomy
Septarian Nodule
Kingdom: n/a
Phylum: n/a
Class: n/a
Order: n/a
Family: n/a
Genus: n/a
Species: n/a
Geological Time Scale
Eon: Phanerozoic
Era: Mesozoic
Period: Cretaceous
Epoch: Late
International Age: Turonian
Stratigraphy
Eagle Ford Group
Arcadia Park Formation
Provenance
Collector: me
Acquired by: Field Collection
Dimensions
Thickness: 5 "
Diameter: 9.5 "
Location
Celina
Collin County
Texas
United States
Comments
Septarian nodules sometimes are misidentified as turtles, coprolites and other fossils. Septarian nodules are hardened mudballs that dehydrate, crack and fill with minerals. The cracks in this one filled with fluorescent calcite. The ribs that stick out are the calcite that filled the cracks in the mudball.
This nodule was found in calcareous shale from the Late Cretaceous Arcadia Park Formation. The exact age of its formation is unknown but probably occured in the Late Cretaceous. Septarian nodules from the Arcadia Park Formation are common in north Texas. Some contain spectacular calcite crystals when cracked open.
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