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Region
- North Pacific Ocean3
- Powder River Basin (Wyo. and Mont.)2
- West Virginia2
- Africa1
- Alaska1
- AlaskaBrooks Range1
- Arctic regions1
- ArizonaGrand Canyon National Park1
- ArizonaPalisades Creek1
- California1
- CaliforniaSan Francisco Bay Area1
- Europe1
- Hawaii1
- Mediterranean Region1
- Mississippi Embayment1
- Morrison Formation1
- New Jersey1
- Pacific Coast (Calif.)1
- Powder River Watershed (Wyo. and Mont.)1
- Puerto Rico1