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Interactive maps > Data download > Radiometric ages of rocks from Alaska

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Geographic subdivisions and overlapping areas

Counties	Quadrangles (1° x 2°)	Hydrologic units (4-digit subregions)
View a fully interactive map Overlapping geographic areas (numbers indicate data points in each area): 3 Seguam 2 Atka 29 Adak 7 Gareloi Island 7 Rat Island 11 Kiska 5 Samalga Island 0 Amukta 14 Attu 5 Unalaska 4 Umnak 16 Prince Rupert 21 Dixon Entrance 3 Simeonof Island 7 False Pass 2 Unimak 135 Ketchikan 36 Craig 21 Stepovak Bay 71 Port Moller 0 Cold Bay 8 Bradfield Canal 41 Petersburg 22 Port Alexander 3 Kaguyak 7 Trinity Islands 20 Sutwik Island 45 Chignik 27 Pribilof Islands 21 Sumdum 58 Sitka 22 Kodiak 3 Karluk 62 Ugashik 0 Bristol Bay 8 Taku River 18 Juneau 24 Mt Fairweather 30 Afognak 49 Mt Katmai 8 Naknek 2 Nushagak Bay 16 Hagemeister Island 0 Atlin 27 Skagway 27 Yakutat 0 Icy Bay 1 Middleton Island 2 Blying Sound 32 Seldovia 42 Iliamna 0 Dillingham 15 Goodnews Bay 0 Kuskokwim Bay 7 Cape Mendenhall 20 Mt St Elias 24 Bering Glacier 15 Cordova 8 Seward 30 Kenai 32 Lake Clark 10 Taylor Mts 4 Bethel 0 Baird Inlet 31 Nunivak Island 15 St Matthew 56 Mccarthy 77 Valdez 113 Anchorage 52 Tyonek 31 Lime Hills 26 Sleetmute 5 Russian Mission 0 Marshall 1 Hooper Bay 79 Nabesna 50 Gulkana 44 Talkeetna Mts 22 Talkeetna 18 Mcgrath 93 Iditarod 6 Holy Cross 0 Kwiguk 0 Black 38 Tanacross 93 Mt Hayes 85 Healy 31 Mt Mckinley 40 Medfra 3 Ophir 9 Unalakleet 0 St Michael 16 St Lawrence 16 Eagle 58 Big Delta 8 Fairbanks 3 Kantishna River 16 Ruby 13 Nulato 2 Norton Bay 10 Solomon 21 Nome 0 Charley River 45 Circle 43 Livengood 8 Tanana 16 Melozitna 0 Kateel River 10 Candle 33 Bendeleben 22 Teller 0 Black River 0 Fort Yukon 1 Beaver 19 Bettles 3 Hughes 9 Shungnak 7 Selawik 0 Kotzebue 0 Shishmaref 4 Coleen 2 Christian 16 Chandalar 9 Wiseman 42 Survey Pass 43 Ambler River 26 Baird Mountains 3 Noatak 1 Table Mtn 0 Arctic 0 Philip Smith Mts 1 Chandler Lake 0 Killik River 10 Howard Pass 5 Misheguk Mountain 0 De Long Mountains 1 Point Hope 4 Demarcation Point 5 Mt Michelson 0 Sagavanirktok 2 Umiat 0 Ikpikpuk River 0 Lookout Ridge 0 Utukok River 0 Point Lay 0 Barter Island 4 Flaxman Island 0 Beechey Point 8 Harrison Bay 5 Teshekpuk 0 Meade River 0 Wainwright 0 Barrow