Ages for Gypsum at Lawrence Co., South Dakota, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of 60Ma - 39Ma at this locality

• Age range from children

• Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
  NAVDAT-2705	60	39				30932	Davier Mine, Annie Creek, Bald Mountain District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT

• Locality age

• Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
  NAVDAT-16731	60	39				45297	Spearfish Peak (Black Butte), Spearfish, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-2703	60	39				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-2704	60	39				122399	Tetro Rock, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-2705	60	39				30932	Davier Mine, Annie Creek, Bald Mountain District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4705	55	40				122354	Terry Peak, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4722	55	40				121686	Astoria Shaft, Ruby Basin District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4724	55	40				121686	Astoria Shaft, Ruby Basin District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4725	55	40				121808	National Gold And Silver Company Mine, Ruby Basin District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4740	55	40				11496	Grants Mine (Hidden Fortune Mine; Sula Claim; Brunnett Claim; St. Patrick Claim; Swamp Eagle Claim; Bingham Claim; Grant Reddy Claim; Iowa Claim; Golden Crown Claim), Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4742	55	40				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4743	55	40				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4744	55	40				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4745	55	40				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4746	55	40				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4747	55	40				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4759	55	40				121799	Minnesota Group (Garden City Claim; Big Red Claim; Dauntless Claim), Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4767	55	40				45297	Spearfish Peak (Black Butte), Spearfish, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4768	55	40				45297	Spearfish Peak (Black Butte), Spearfish, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4776	58	50				121677	Alpine - Strawberry Mining Company (New Era Mining Company), Black Hills District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4777	58	50				121677	Alpine - Strawberry Mining Company (New Era Mining Company), Black Hills District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4780	58	50				121677	Alpine - Strawberry Mining Company (New Era Mining Company), Black Hills District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-4781	58	50				121677	Alpine - Strawberry Mining Company (New Era Mining Company), Black Hills District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5869	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5870	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5871	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5872	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5873	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5874	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5875	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5876	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5877	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5878	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5879	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5880	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5881	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5882	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5883	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5884	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-5885	55	45				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-6900	59	38				121691	Bear Gulch Pegmatite Prospect (Elizabeth No. 8 Claim), Tinton Pegmatite District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92273	54.85	54.47				30932	Davier Mine, Annie Creek, Bald Mountain District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92295	58	46				11496	Grants Mine (Hidden Fortune Mine; Sula Claim; Brunnett Claim; St. Patrick Claim; Swamp Eagle Claim; Bingham Claim; Grant Reddy Claim; Iowa Claim; Golden Crown Claim), Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92297	58	46				121730	Echo Mine, Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92298	58	46				11496	Grants Mine (Hidden Fortune Mine; Sula Claim; Brunnett Claim; St. Patrick Claim; Swamp Eagle Claim; Bingham Claim; Grant Reddy Claim; Iowa Claim; Golden Crown Claim), Lead District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92330	58	46				121728	Eagle Bird Mine, Ragged Top District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92333	58	46				121812	Oro Fino Mine, Galena District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92337	58	46				122218	Bear Den Mountain, Galena, Galena District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92342	58	46				45297	Spearfish Peak (Black Butte), Spearfish, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92344	58	46				23014	Silver Queen Mine (New Silver Queen Mine), Deadwood, Galena District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92355	58	46				121691	Bear Gulch Pegmatite Prospect (Elizabeth No. 8 Claim), Tinton Pegmatite District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92367	58	46				121697	Black Diamond Mine (Black Diamond Group; Spearfish Gold Mining Company), Ragged Top District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  NAVDAT-92368	58	46				121677	Alpine - Strawberry Mining Company (New Era Mining Company), Black Hills District, Lawrence Co., South Dakota, USA	NAVDAT	NAVDAT
  USGS-Rb-Sr-04812	1871.18	1731.18				122233	Little Elk Creek Canyon, Piedmont, Lawrence Co., South Dakota, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-04818	1871.18	1731.18				122087	Little Elk Creek, Nemo, Lawrence Co., South Dakota, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-04819	1871.18	1731.18				122087	Little Elk Creek, Nemo, Lawrence Co., South Dakota, USA	USGS-Rb-Sr	USGS-Rb-Sr
  USGS-Rb-Sr-04822	1863.36	1863.36				122087	Little Elk Creek, Nemo, Lawrence Co., South Dakota, USA	USGS-Rb-Sr	USGS-Rb-Sr