. Early geophysical papers of the Society of Exploration Geophysicists . ââââ/00°f7 isotherm*/ surface â¢7bp of" Lower- Srovvn zone Fig. 4. Long Beach Dome, Los Angeles County, California. Fig. In general, the isothermal surfaces are flatter than the surfaces of the strata and the flatness increases with diminishing depth until a point is reached near the surface of the ground at which the isothermal surfaces tend more or less to conform to surface topography. As the effects of surface tfiOO \ % £â â {sf&V^&s^ceA^j^^ tture fl/-_ g;^^^

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