Sunday, August 3, 2008

Black Chasm Cave
From Wikipedia, the free encyclopedia

Black Chasm Cave is a cave near Volcano, California and is a National Natural Landmark.

Black Chasm Cave was designated as a National Natural Landmark by the National Park Service in 1976. It was recommended for this protection by members of the National Speleological Society who had made explorations of its numerous chambers in the 1960s.

One of the outstanding geological features of this cave (and a major reason for its NNL designation) is the profusion of helictite crystals located in the Landmark Room. These unusual speleothems or formations are probably creat

Indian Grinding Rock SHP
State Historic Park

Indian Grinding Rock State Historic Park is located in the Sierra Nevada foothills eight miles east of Jackson. The park nestles in a little valley 2,400 feet above sea level with open meadows and large valley oaks that once provided the native Americans of this area with an ample supply of acorns. The park was created in 1968 and preserves a great outcropping of marbleized limestone with some 1,185 mortar holes -- the largest collection of bedrock mortars in North America.

The park is northeast of Stockton in the lower foothills of the Sierra Nevada mountains. Take State Highway 88 East through Jackson to the town of Pine Grove. Take a left turn on the Pine-Grove-Volcano Road, and about a mile and a half later you will enter the Park. The SECOND turnoff is the main entrance (the first is to the small campground)(US.GOV SHP).

I have heard rumors of the location of the infamous Farmington Chert. It is not chert at all, but a green coarse rhyolite I am guessing. Most of the stuff is to granular to knap.

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