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Agate Fossil Beds National Monument

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Volcanic Ash, Tephra Fall, and Fallout Deposits
バージョン: 3管理者: 1コレクション: 0CC0 1.0 — public domain
Volcanic ash, pumice, and tephra ejected in volcanic eruptions ultimately falls back to Earth where it covers the ground. These deposits may be the thin dustings or may be many tens of feet (meters) thick near an eruptive vent. Volcanic ash and tephra can present geohazards that are present great di
Updated Species Database Will Help Boost Amphibian Conservation Across the National Park Service
バージョン: 1管理者: 1コレクション: 0CC0 1.0 — public domain
Updated Species Database Will Help Boost Amphibian Conservation Across the National Park Service
Project Profile: Manage Invasive Plants in Northern Great Plains
バージョン: 1管理者: 1コレクション: 0CC0 1.0 — public domain
Project Profile: Manage Invasive Plants in Northern Great Plains
Agate Fossil Beds: The Geology Behind Nebraska's Miocene Bonebeds
バージョン: 3管理者: 1コレクション: 0CC0 1.0 — public domain
Agate Fossil Beds: The Geology Behind Nebraska's Miocene Bonebeds
Managing Invasive Grasses at Northern Great Plains Parks
バージョン: 1管理者: 1コレクション: 0CC0 1.0 — public domain
Managing Invasive Grasses at Northern Great Plains Parks