Hanyar da aka yi amfani da ita

A cikin ilimin ƙasa da ilimin ƙasa, shimfidar ƙasa mai laushi shine dutse mai laushi wanda aka raba shi zuwa polygons ta hanyar karyewa, sau da yawa haɗin kai, a cikin dutse. Wannan nau'in dutse yana ɗauke da wannan sunan saboda an karye shi cikin tubalan polygonal waɗanda suke kama da tiles na bene na mosaic, ko tessellations.

## Bayani na gaba ɗaya
An gane nau'ikan shimfidar shimfidar wuri guda huɗu: shimfidar dutse da aka kafa ta hanyar haɗuwa; shimfidar ƙasa da aka kafa da raguwar sanyaya; shimfidawa da aka kafa don fashewar laka da lithification; da shimfidar sandstone da ba a san asalinsa ba.

Mafi yawan nau'ikan titin tessellated sun ƙunshi shimfidar dutse, yawanci saman gadaje na sandstones da sauran duwatsu masu laushi, waɗanda aka raba su cikin ko dai fiye ko ƙasa da rectangles na yau da kullun ko tubalan da ke kusantar rectangels ta hanyar tsarin haɗin gwiwar orthogonal da aka haɓaka sosai. Yankin gadoji na mutum, kamar yadda aka fallasa ta hanyar rushewa, yawanci ana raba su zuwa ko dai murabba'i, rectangles, da kuma ƙananan triangles ko wasu siffofi, dangane da lambar da daidaitawar haɗin gwiwa waɗanda suka ƙunshi tsarin haɗin gwiwa. Wannan shimfidar shimfidar wuri na gadoji na duwatsu masu laushi ana canza su akai-akai ta hanyar yanayi tare da haɗin gwiwa don haifar da dutsen da ke tare da haɗin gwiwar da za a ɗaga ko kuma a rufe shi sakamakon lalacewar bambanci. Ana yawan lura da irin wannan shimfidar shimfidar wuri a kan iyakar bakin teku inda aikin raƙuman ruwa ya haifar da dandamali masu laushi da yawa waɗanda ke fallasa dutse mai haɗin gwiwa kuma yana kiyaye saman waɗannan dandamali da ke da tsabta daga tarkace.

Nau'in na biyu na shimfidar wuri ya ƙunshi dutse wanda ke nuna haɗin gwiwa waɗanda ke samar da polygons waɗanda yawanci suna da girma, sarari, da junctions. Yawanci, waɗannan polygons suna wakiltar sassan giciye na polygonal, yawanci haɗin hexagonal, wanda ake kira haɗin ginshiƙi, wanda aka kafa sakamakon sanyaya na basaltic lava. Ana iya ganin irin wannan farfajiyar a Giant's Causeway a Arewacin Ireland.

Nau'in na uku na tesselation wanda Branagan ya gane  yana da alaƙa da raguwa da fashewar ƙwayoyin ƙwayoyin cuta, ko dai laka ko calcareous, sediments. Sun kunshi fashewar polygonal, sau da yawa ana danganta su da 'farantin' na mutum wanda ke da alaƙa da zama a sama, wanda ke nuna kafawar laka a cikin tsaunuka masu kyau. Sau da yawa, ana adana siffofin polygons da aka kafa ta wannan nau'in fashewa kuma ana jaddada su ta hanyar cika fashewar fashewar da kayan da suka bambanta da na ko dai yumbu ko yumbu wanda fashewar ta samo asali. Cika fashewar fashewar ta hanyar turɓaya na wani hali daban sau da yawa yana adana tsarin polygonal na fashewar inda za'a iya gano shi ta hanyar rushewa a matsayin hanyar da aka tsara bayan turɓaya ta zama lithified a cikin dutse mai turɓaya.

Nau'in karshe na shimfidar shimfidar wuri ya ƙunshi shimfidar ƙasa, shimfidar dutse wanda yawanci ke nuna tsari mai rikitarwa na polygons biyar ko shida. Yawanci, waɗannan polygons sun bambanta sosai a girman daga 0.5 zuwa 2 m a fadin. Wadannan polygons an bayyana su ne ta hanyar karye-karye masu kyau waɗanda wani lokacin suna da tsawo. Ana samun su a cikin fallasawar Hawkesbury Sandstone a cikin Sydney, New South Wales, yankin Australia, fallasawar Precipice Sandstone a Kenniff Cave Archaeological Site a Queensland, Australia, da kuma fallasawar Upper Cretaceous sandstones na Boulder, Colorado, Amurka, yankin. Asalin wannan nau'in shimfidar wuri ya kasance ba shi da tabbas. Girman da siffar waɗannan polygons sun bayyana sun dogara sosai da girman hatsi, ƙwayoyin, da haɗin dutsen. Wannan tessellation na polygonal ya fi dacewa a cikin ƙananan ƙwayoyin ƙwayoyin cuta, uniform, da siliceous ko silicified sandstones.

## Hanyar da aka rufe, Eaglehawk Neck, Tasmania

Misali mafi sananne na shimfidar tessellated shine Tessellated Pavement wanda aka samu a Lufra, Eaglehawk Neck a kan Tasman Peninsula na Tasmania. Wannan shimfidar shimfidar wuri ta ƙunshi dandalin ruwa a bakin tekun Pirates Bay, Tasmania. Wannan misali ya kunshi nau'ikan tsari guda biyu: tsari na pan da tsari na **'gurasar**'.

Tsarin pan shine jerin ɓarkewar ɓarkewa a cikin dutse wanda yawanci yakan kasance a bayan gefen bakin teku. Wannan bangare na titin ya bushe sosai a lokacin da ruwa ya ragu fiye da ɓangaren da ke kusa da bakin teku, yana ba da damar lu'ulu'u na gishiri don ci gaba; saboda haka farfajiyar "pans" tana lalacewa da sauri fiye da haɗin gwiwa, wanda ke haifar da karuwar concavity.

Tsarin gurasar yana faruwa a sassan titin da ke kusa da bakin teku, waɗanda aka nutse cikin ruwa na dogon lokaci. Wadannan sassan titin ba su bushe sosai ba, suna rage matakin gishiri. Ruwa, dauke da yashi mai laushi, yawanci ana tura shi ta hanyar haɗin gwiwa, yana sa su lalace da sauri fiye da sauran hanyar, suna barin tsarin gurasar da ke fitowa.

## Manazarta