Castleguard Cave, Limestone cave system at Columbia Icefield, Banff National Park, Canada
Castleguard Cave is a limestone cave system near Columbia Icefield in Banff National Park. The passages extend through multiple layers of rock formations and represent one of Canada's most extensive underground networks.
The cave was first documented in 1921 by Cecil Smith while searching for lost horses in the area. Systematic exploration efforts by McMaster University researchers began in the following decades.
The National Film Board produced a documentary about Castleguard Cave, bringing attention to its geological features and scientific significance.
Access to the cave is challenging and typically requires specialized transport or long hikes due to park restrictions. Visitors should check current conditions before planning a trip to the site.
The cave passages end at glacial ice plugs from the Columbia Icefield, creating a rare geological environment. In certain chambers, cubic pearl formations appear, a mineral variety found in only a handful of locations worldwide.
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