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Precolumbian Era: 1 Billion BC - 1500 AD Exploration: 1500 - 1854 Kansas Territory: 1858 - 1861 Douglas County Infancy: 1862 - 1874 Closing the Frontier: 1875 - 1881 Building Douglas County: 1882 - 1899 Agriculture and Ranching: 1900 - 1918 Boom and Bust: 1920 - 1939 Small Town USA: 1940 - 1959 Destruction and Recovery: 1960 - 1979 Growth and Prosperity: 1980 - 2000 Search Our Database Event Keyword Area Name Select One or More All Castle Rock Franktown Highlands Ranch and Lone Tree Larkspur Louviers Mountains Parker Roxborough Sedalia Spring Valley, Cherry Valley & Greenland Start Year Start Epoch Select One AD (Anno Domini) BC (Before Christ) End Year End Epoch Select One AD (Anno Domini) BC (Before Christ)   Areas covered by the Timeline include: Castle Rock, Franktown, Highlands Ranch and Lone Tree, Larkspur, Louviers, Mountains, Parker, Roxborough, Sedalia, Spring Valley, Cherry Valley & Greenland,   Please click here to view the Timeline without images.