Offered in this lot are Vesicular Basalt Specimens, Siskiyou County California, C. 1250AD, Ancient Modoc period, provenance card included. Vesicular basalt is a type of extrusive igneous rock; specifically, it is a basalt rock with numerous visible holes called vesicles, formed by trapped gas bubbles during the rapid cooling of lava, giving it a porous appearance. Siskiyou County, California has a long history of volcanic activity, including the formation of Mount Shasta and its adjacent cones with the most recent eruption occuring approximately 200 years ago at the Hotlum cone. The first specimen is a "two-horned mano", found at the Nightfire Island archeological site that was a Modoc hunter-gatherer village west of Lower Klamath Lake, collected by Klamath educator Carrol Howe. The second specimen, also vesicular basalt resembles an early mortar though in a conical shape. Both specimens are in very nice preserved condition. Two-horned Mano measures 2.75"W x 4.25"L x 3"H, "mortar" is 5.125" diameter base, 3.75"H. Collective weight is 3lb, 2oz.