What is a marble cavern?
Marble is a metamorphic rock made up primarily of calcium carbonate, which comes from fossilized, mostly microscopic seashells. Since calcium carbonate is water soluble, given enough time, ground water flowing through the rock will eventually dissolve passageways. When mountain uplift moves these passageways above the water table, air enters them and we recognize them as caves or caverns. What’s the best season? It’s not that simple. They’re all good. Spring is great in the foothills portion of Sequoia, where wildflower shows are often magnificent. The sequoia groves at Giant Forest and Grant Grove are hospitable and good for strolling or hiking all summer and well into the fall. In the high country, the season usually runs from late June into mid-October. Winter is a great time for cross-country skiing or snowshoeing. Some of the park is undeveloped wilderness. What kind of backwoods skills are needed to experience that wilderness? About 84% of these parks are congressionally-designat
