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They built upon previous syntheses and models such as Dibblee ( 1961 ) , Garfunkel ( 1974 ) , and Dokka ( 1983 ) that described several kilometers of separation on most faults and proposed that some blocks bounded by the faults rotated as fault separation accumulated ( Valentine and others , 1993 ) . Some blocks broken by cracks less than one to several tens of centimeters wide are filled with fine-grained matrix ( material that was thoroughly shattered and mixed during emplacement of the deposit ) . In Parrish , the issue of blocks integrating with the rest of the hall was brought up ; while residents of some blocks integrated well with their respective halls , it was felt that others did not .