Viviparous Reesidei Snail in Matrix

Fossil Snail in Matrix - Viviparous Reesidei from Utah. There's another snail hiding on the edge of the mudstone, not as good but you can see it. 
Measurements are about:  33mm x 29mm and 24mm thick. Weighs .7 oz. The snail alone measures about: 11mm x 10mm.
 
Snail comes from Grand County, Utah found in the Brushy Basin Member in the Morrison Formation. This snail is about 140 million years old from the Jurassic Time Period and is very rare.