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Ischyromys typus is one of the oldest known rodents. It lived during the Oligocene (32-30 million years ago). It had the characteristic rodent incisors and resembled a mouse or squirrel, but was not related to either. Its hind legs were longer than its forelegs and it was likely arboreal.

Because of replacement minerals, most of the fossil mammal teeth from the White River Formation of Nebraska and South Dakota will fluoresce to some degree. The teeth are usually replaced by calcite, which will fluoresce a yellow to yellow-orange. Any green showing up on the specimen is usually chalcedony and is usually part of the bone or bone marrow. On a few specimens there may be a bright green at the base of the specimen this will be an oil based clay holding up the specimen. Any purple on the specimen is the UV light reflecting off the light colored areas of the specimen and is not fluorescence. The fossil teeth from Nebraska and South Dakota will fluoresce under either long or short wave, but they fluoresce best under both at the same time. You may see a photo of some of the specimens under normal light by returning to the main fluorescent page and clicking on the link "to view specimen material from Nebraska or South Dakota." You may also view all teeth under normal lighting by going to the fossil teeth page and then to the appropriate page for the teeth you want to view. The item number will be the same as the number in the fluorescent section without the "F" at the end of the number.

The first image was taken under long wave UV lighting. The photo below was taken under short wave Ultraviolet lighting.

Ischyromys had four molars on either side, top and bottom. This specimen is a nearly complete upper skull with maxilla and incisors at the front edge. The specimen is from the White River Formation, Brule Member.

Kingdom: Animalia, Phylum: Chordata, Class: Mammalia, Order: Rodentia, Sub-Order: Sciurognathi, Family: Ischyromyidae, Genus: Ischyromys, Species: typus.

Squirrel - Ischyromys typus
 
Squirrel - <i>Ischyromys typus</i> Quantity in Basket: None
Code: TNES-101F
Price: $100.00
Shipping Weight: 0.28 pounds
 
 
Quantity:
 
Time: Early Eocene through Early Oligocene, approximately 40 - 30 million years ago.
Location: White River Formation, Brule Member, Nebraska Badlands, USA
Dimensions: 1-5/8" x 3/4" x 3/4"



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