Rashin rairayin bakin teku

tafkin rairayin bakin teku, wanda aka fi sani da Paleo-beach, burbushin burbushin halittu ko rairayin rairayin kankara,  tsohuwar rairayin teku ce ko rairayar bakin teku da aka adana a cikin burbushin halitta saboda canji a matakin ruwa ko matakin teku, ko kuma saboda canjiyar tsawo.  Sau da yawa yana nan a matsayin laka ko terrace, tare da burbushin da suka shafi rairayin bakin teku da siffofi, sama da bakin teku na yanzu.

 Dalilan da suka haifar 
An halicci iyakar bakin teku da ke da alaƙa da matakin teku saboda manyan dalilai guda uku: motsi na tectonic wanda ke haifar da canje-canje a cikin tsawo na ƙasa, ɗagawa da warping saboda sauke ƙanƙara da ruwan teku a lokacin deglaciation, da saukowar matakan teku a lokacin glaciations. Sakamakon da wadannan dalilai uku suka haifar sau da yawa ana haɗa su, wanda ke rikitar da fassarar tsoffin bakin teku, da kuma kimantawa na tsoffin matakan teku a lokacin Quaternary.

 Wurin da bincike 
A Amurka, ana iya gano rairayin bakin teku na burbushin halittu inda ake samun dutse mai laushi ko aikin hakar ma'adinai. Misali, Miami tana da rairayin bakin teku masu yawa waɗanda aka fallasa ta hanyar hakar dutse. Wani sanannen misali shine gadajen Pinecrest - wani dutse mai dauke da burbushin da aka samo a kudancin birnin wanda shine wani bangare na tsarin ilimin ƙasa mafi girma - Tsarin Tamiami. Tsibirin Portland, sanannen Dutsen Portland yana da misalai da yawa a bakin tekun.

Binciken rairayin bakin teku a duk duniya yana da mahimmanci musamman lokacin da masana kimiyya ke ƙoƙarin tantance matsayin tsoffin rairayin kan teku, wanda zai iya taimakawa wajen fahimtar yadda matakan teku zasu iya tashi a cikin duniya mai dumi, musamman a cikin yanayin Canjin yanayi na duniya.

 Manazarta