In 1951, the " source rocks " could form the enormous volume of hydrocarbons, and therefore offered abiotic deep petroleum as the most plausible explanation . ( Humic coals have since been proposed for the source rocks . ) Others who continued Kudryavtsev's work included Petr N . Kropotkin, Vladimir B . Porfir'ev, Emmanuil B . Chekaliuk, Vladilen A . Krayushkin, Georgi E . Boyko, Georgi I . Voitov, Grygori N . Dolenko, Iona V . Greenberg, Nikolai S . Beskrovny, and Victor F . Linetsky.
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