Ƙirƙirar wani nau'i mai mahimmanci na wannan jumla Wadannan siffofi suna samuwa a wasu saitunan tsarin.
Tabbas, wani nau'i mai rikitarwa na jumla shine "Waɗannan siffofi suna samuwa a cikin wasu tsarin tsarin, kuma a cikin yanayin kogin anticlines, suna samarwa saboda yawan raguwa, yawanci a cikin saitunan orogenic. "