Degonia Chert
© 2003 by the Center For Social Research, Parkland College
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TEXTURE:
The texture is medium to fine grained.
LUSTER:
Luster tends to be dull to waxy.
COLOR:
Colors range from white to gray to blue. Values tend to be lighter. Fossiliferous voids and fracture planes frequently display coatings of white or orange.
FOSSILS:
Degonia is decidedly fossiliferous. Sponge spicules and crinoid columnals will be present. Negative cast fossils appearing as small voids are common.
STRUCTURAL CHARACTERISTICS:
Some voids will be filled with iron oxides and others with calcite crystals.
HEAT TREATMENT:
Degonia Chert is not typically heat treated.
SOURCE:
The illustrated specimens were recovered from a bed rock exposure on the southeast slopes of Julien Hill in sec. 18, T. 12 S., R. 7 E., Pope County, Illinois.
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