Geo

70 Pins
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7y
Geologic Map of North America [1024x1765]
Geology of North America - map
Map of Russia ~ Free Vintage Image - The Old Design Shop
Map of Russia ~ Free Vintage Image
"map of the supercontinent Pangaea" Poster for Sale by Richard Morden
Pangaea | Richard Morden
This is a very, very large concretion in Bosnia. Concretions are formed when minerals are precipitated in the pore spaces between grains of sedimentary rock.
Nature, Science and Art
A Correlated History of Earth, showing the 4.5 billion years of earth's history. Each column represents a timeline from ancient (at the bottom) to recent (at the top) times.
Grand Staircase Escalante National Monument - Moqui-Marbles
"The abundant concretions found in the Navajo Sandstone consist of sandstone cemented together by hematite (Fe2O3), and goethite (FeOOH). The iron forming these concretions came from the breakdown of iron-bearing silicate minerals by weathering to form iron oxide coatings on other grains." en.wikipedia.org/wiki/Navajo_Sandstone#Iron_oxide_concret...
MSN
Most Mysterious Places On Earth | Eye of Africa, Mauritania - Most mysterious places on Earth
The Terrifying Devil's Sinkhole In Texas
TEXAS! The Devil's Sinkhole is 400 feet deep with a 40x60 diameter opening. It has been a registered National Landmark since 1985 and is the largest and third deepest single chamber cavern in the state.