Object Record

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Object Name Ammonitida (indeterminate)
Object Description Sample of two pyritized Jurassic ammonites (extinct cephalopods) in light gray limestone. Both are well preserved, involute, planispiral although they are likely different species. The smaller shell has stout ribs that lean away from the living chamber at the external edge. A faintly ribbed keel is present with grooves along either side. The larger shell (approximately 4 cm across) has sharper ribs, each having a small knob toward the venter. The suture pattern on both specimens is ammonitic with rounded folioles and pointed lubules.
Dimensions H-4.09 W-7.865 L-7.955 cm
Catalog Number 00.13118