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The Franklin Mountians
Transcript of The Franklin Mountians
The oldest rocks found in our area are only 1.2 to 1.4 billion years old.
Deposited along the shore of a shallow tropical sea.
Found along the Castner Formation
Intrusion of silicon-aluminum rich magmas.
Produced two types of rocks:
Red Bluff Granite
Sea levels rise
North American continental shelf
Deposition of sea and marine sediments
1.1 BY Ago
500 MY Ago
Sea levels fell, leaving behind Hueco Limestone and Fossils
Marine invertebrates, nautoloids, cephalopods.
250 MY Ago
Start of the mountain building process
Old rock next to new rock
45 to 50 MY Ago
"Pull apart" stresses created many of today's geographical features.
Rio Grande Rift
Hueco Mtns and Hueco Bolson
Franklin Mtns and Mesilla Bolson
This process still continues today
35 MY Ago
Rio Grande emptied into Lake Cabesa de Vaca
Evidence in river and lake sediment that fill present day basins