2006 39c Mammoth Cave, Longest Cave
# 4068 FDC - 2006 39c Mammoth Cave, Longest Cave
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U.S. #4068
Mammoth Cave
Wonders of America
Mammoth Cave
Wonders of America
Issue Date: May 27, 2006
City: Washington, DC
Quantity Issued: 204,000,000
Printed by: Avery Dennison
Printing Method: Photogravure
Perforation: Serpentine die cut 10 ¾
Color: Multicolored
City: Washington, DC
Quantity Issued: 204,000,000
Printed by: Avery Dennison
Printing Method: Photogravure
Perforation: Serpentine die cut 10 ¾
Color: Multicolored
Mammoth Cave system is the world’s longest recorded cave system. With more than 360 miles mapped, it is at least three times longer than any cave known. Geologists estimate that there could be an additional 600 miles of undiscovered passages.
The cave lies in a central-Kentucky limestone ridge with a sandstone cap that makes the system very stable. Over millions of years, mildly acidic water ran through cracks and wore away limestone to form the cave.
Mammoth Cave contains several lakes, rivers, and waterfalls. Small, eyeless fish live in the largest river, Echo River. Other blind creatures in the cave include beetles and the endangered Kentucky cave shrimp.
Ownership by white men began in the late 1700s; they mined the saltpeter found in the cave. When saltpeter prices fell after the War of 1812, mining was abandoned, and the cave became a tourist attraction. The fame of Mammoth Cave grew.
Hard times in the early 20th century moved owners of smaller, neighboring caves to try to lure Mammoth Cave tourists to their own. A typical strategy was to hop onto the running board of a tourist’s car and inform him that Mammoth Cave was closed. Mammoth Cave was fully established as a national park in 1941.
U.S. #4068
Mammoth Cave
Wonders of America
Mammoth Cave
Wonders of America
Issue Date: May 27, 2006
City: Washington, DC
Quantity Issued: 204,000,000
Printed by: Avery Dennison
Printing Method: Photogravure
Perforation: Serpentine die cut 10 ¾
Color: Multicolored
City: Washington, DC
Quantity Issued: 204,000,000
Printed by: Avery Dennison
Printing Method: Photogravure
Perforation: Serpentine die cut 10 ¾
Color: Multicolored
Mammoth Cave system is the world’s longest recorded cave system. With more than 360 miles mapped, it is at least three times longer than any cave known. Geologists estimate that there could be an additional 600 miles of undiscovered passages.
The cave lies in a central-Kentucky limestone ridge with a sandstone cap that makes the system very stable. Over millions of years, mildly acidic water ran through cracks and wore away limestone to form the cave.
Mammoth Cave contains several lakes, rivers, and waterfalls. Small, eyeless fish live in the largest river, Echo River. Other blind creatures in the cave include beetles and the endangered Kentucky cave shrimp.
Ownership by white men began in the late 1700s; they mined the saltpeter found in the cave. When saltpeter prices fell after the War of 1812, mining was abandoned, and the cave became a tourist attraction. The fame of Mammoth Cave grew.
Hard times in the early 20th century moved owners of smaller, neighboring caves to try to lure Mammoth Cave tourists to their own. A typical strategy was to hop onto the running board of a tourist’s car and inform him that Mammoth Cave was closed. Mammoth Cave was fully established as a national park in 1941.