no such formation "lower chazy" need ap roper name not some slang name
For the geologically curious, here is a reference to the rock units the term Chazy references. http://ngmdb.usgs.gov/Geolex/UnitRefs/ChazyRefs_1004.html
Mike is technically correct it is not a specific formation, however, it would not be correct to call it slang, perhaps professional shorthand.
Very much interested in this. Keep the info coming. All these Trenton wells get their oil somewhere!