Agate Fossil Beds National Monument

Location:Nebraska, United States
IUCN Category:V
Area:4,731 acres (1,915 hectares)
Species:All  Endangered  Invasive
Website:View website
Climate:View Climate Data
Land Use:View Land Use Data
Köppen climate classification:BSk (Climate: arid; Precipitation: steppe; Temperature: cold arid)


Northern short grasslands
Western short grasslands


Protected Area Boundary
Share70 %30 %
Soil TypeLuvic KastanozemsEutric Regosols
Topsoil TextureMediumMedium
Reference Depth100 cm100 cm
DrainageModerately wellModerately well
Available Water Capacity150 m150 m
Topsoil Properties
Gravel8 %27 %
Sand36 %47 %
Silt41 %34 %
Clay23 %19 %
USDA TextureLoamLoam
Reference Bulk Density1.38 g/cm³1.43 g/cm³
Bulk Density1.2 g/cm³1.21 g/cm³
Organic Carbon1.27 %0.97 %
Clay Cation Exchange Capacity66 cmol kg⁻¹41 cmol kg⁻¹
Soil Cation Exchange Capacity23 cmol kg⁻¹12 cmol kg⁻¹
Base Saturation100 %79 %
Total Exchangeable Bases18.4 cmol kg⁻¹15.1 cmol kg⁻¹
Calcium Carbonate4.5 %0 %
Calcium Sulphate0 %0 %
Exchangeable Sodium3 %1 %
Electrical Conductivity0.1 dS m-10.1 dS m-1
Subsoil Properties
Gravel5 %28 %
Sand29 %50 %
Silt42 %32 %
Clay29 %18 %
USDA TextureClay loamLoam
Reference Bulk Density1.33 g/cm³1.44 g/cm³
Bulk Density1.18 g/cm³1.46 g/cm³
Organic Carbon0.57 %0.4 %
Clay Cation Exchange Capacity68 cmol kg⁻¹55 cmol kg⁻¹
Soil Cation Exchange Capacity24 cmol kg⁻¹11 cmol kg⁻¹
Base Saturation100 %85 %
Total Exchangeable Bases21.1 cmol kg⁻¹10.3 cmol kg⁻¹
Calcium Carbonate10 %0.1 %
Calcium Sulphate0 %0 %
Exchangeable Sodium3 %2 %
Electrical Conductivity3.6 dS m-10.1 dS m-1
Soil data provided by FAO/IIASA/ISRIC/ISSCAS/JRC, 2012. Harmonized World Soil Database (version 1.2). FAO, Rome, Italy and IIASA, Laxenburg, Austria.
Köppen climate classification provided by Kottek, M., J. Grieser, C. Beck, B. Rudolf, and F. Rubel, 2006: World Map of Köppen-Geiger Climate Classification updated. Meteorol. Z., 15, 259-263