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Olema Lime Kilns
The Olema Lime Kilns at Point Reyes National Seashore in California were built in 1850 on land leased from Mexican grantee Rafael Garcia by James A. Shorb and William F. Mercer, two San Francisco entrepreneurs. The kilns were reportedly fired only a few times, and have lain abandoned for some 140 years. They were apparently abandoned no later than 1855 after only a few firings, probably due to the poor quality, small limestone deposits and the financial depression of that year. They represent a Gold Rush era effort to establish a lime-producing industry in Marin County, only two years after cession of Alta California to the United States by Mexico. They consist of three long-abandoned, barrel-shaped stone vaults lying in ruins against a hillside on the east side of Olema Creek about five miles south of Olema and about 100 yards west of California State Highway 1.
==Kiln No. 1==
The kiln on the south was built of gray limestone which on the interior of the barrel was cut and fitted to enable application of a smooth coating of fireclay and, running halfway around the back, firebrick. Use of firebrick as a lining at the back suggest treatment for higher temperature there. The outer casing, rectangular in shape, was also built of cut limestone. Between the inner and out casings is afilling composed of irregular chunks of limestone set in mud or clay mortar. When these kilns were abandoned, Kiln No. 1 was loaded with limestone but not fired, rendering measurement of its interior impossible.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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