Several types of high-temperature combustion metamorphic (CM) rocks of the Hatrurim Formation occur in several areas located in the vicinity of the Jordan Rift Valley. Spurrite marbles, larnite-bearing rocks, pyroxene-anorthite and melilite hornfelses, and paralavas have been identified. The appearance of CM rocks is genetically related to the explosions of ancient mud volcanoes. A process was accompanied by combustion of hydrocarbon gases (mainly methane) both in local foci and larger areas. The following minerals indicate ultra-high temperature of pyrometamorphism: spurrite, larnite, bredigite, pseudowollastonite, rankinite, brownmillerite, periclase, CaO, cuspidine, nagelschmidtite. According to mineralogical data, the temperature of rocks heating attained 1200ºC. Unique combination of numerous types of brecciated rocks, CM foci showing extremely high temperature gradients, and particular hydrothermal mineralization are reliable indicators of hydrocarbon (mainly gas) reservoirs in a deep sedimentary stratum, which partially degassed during ancient mud volcano events.