Rock County, Nebraska – Midcontinent

#85, project 1, show in map.

Age (Ma)
0.010.00
Cenozoic
Quaternary
Holocene
Pleistocene
Late Pleistocene
Unnamed
1.9 Ma
2
Cenozoic
Quaternary
Pleistocene
Gelasian
Neogene
Pliocene
Piacenzian
Long Pine Formation
Keim Formation
3.9 Ma
10
Cenozoic
Neogene
Miocene
Messinian
Tortonian
Serravallian
Ash Hollow Formation
Valentine Formation
3.8 Ma
3020
Cenozoic
Neogene
Miocene
Burdigalian
Aquitanian
Paleogene
Oligocene
Chattian
Rupelian
Eocene
Priabonian
Arikaree Group
Brule Formation
Chadron Formation
45.9 Ma
82
Mesozoic
Cretaceous
Late Cretaceous
Campanian
Santonian
Pierre Formation
2.0 Ma
1009590
Mesozoic
Cretaceous
Late Cretaceous
Santonian
Coniacian
Turonian
Cenomanian
Early Cretaceous
Albian
Niobrara Formation
Carlile Formation
Greenhorn Formation
Graneros Formation
Dakota Group
198.5 Ma
310305
Paleozoic
Carboniferous
Pennsylvanian
Gzhelian
Kasimovian
Moscovian
Shawnee Group
Douglas Group
Pleasanton Group and Kansas City Gp and Lansing Gp
Marmaton Group
Cherokee Group
39.5 Ma
352
Paleozoic
Carboniferous
Mississippian
Tournaisian
Gilmore City Formation
97.4 Ma
455
Paleozoic
Ordovician
Late Ordovician
Katian
Sandbian
Galena Group
Decorah Formation
543.5 Ma
1,7001,6501,6001,5501,5001,4501,4001,3501,3001,2501,2001,1501,1001,0501,000
Neoproterozoic
Tonian
Mesoproterozoic
Stenian
Ectasian
Calymmian
Paleoproterozoic
Statherian
Unnamed