A new autographic dilatcmeter of high sensitivity for the measurement of linear thermal expansion is described. Results are given frcm 20° to 700° C. fer calcite, var. Iceland spar, from Chihuahua, Mexico, and for Yule marble frcm Yule Creek, Colorado. The data for calcite is an approximate mean of previously published, low temperature values for orientations parallel and perpendicular to the c axis. Results for Yule marble indicate a possible correlation between linear thermal expansion and fabric analysis. The abnormal values for the marble are explained tentatively on the basis of recrystallizaticn and residual strain.

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