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A cikin ilimin ƙasa da ilimin ƙasa, paleosurface wani wuri ne da aka yi ta hanyar rushewa tsohuwar zamani. Paleosurfaces na iya zama kwance ko rashin daidaito a wasu lokuta suna da sauƙin gaske. Flat da manyan paleosurfaces - wato farfajiyar tsari - suna da damar da za a adana su fili da ƙananan farfajiyoyi da ba daidai ba kuma saboda haka sune mafi yawan nazarin nau'ikan paleosurfacs. Abubuwan da ba su dace ba, ko da yake yawanci karami fiye da filayen, suna faruwa a duk faɗin duniya,  misali ɗaya shine Sudetes etchsurfaces.  A cikin yanayin peneplains ana jayayya cewa sun zama paleosurfaces da zarar an cire su daga matakin tushe da suka ba da darajar.

Paleosurfaces sun zama wani muhimmin bangare na rikodin ilimin ƙasa saboda suna wakiltar abubuwan da suka faru na ilimin ƙasa da na ƙasa.

A al'adance masanin ilimin ƙasa da masanin ilimin lissafi suna kallon paleosurfaces daban. Masana ilimin ƙasa suna duban hanyoyin endogenic ko masu ginawa da ke faruwa don ƙirƙirar wannan farfajiyar, kamar ɗagawar ɓawon burodi da aikin igneous. Masana ilimin ƙasa suna da daraja ga rikodin stratigraphic wanda ke ba da damar yin la'akari da nau'ikan nau'ikan ƙasa. Koyaya, lokacin da masu ilimin ƙasa ke kallon paleosurfaces ana la'akari da hanyoyin exogenic ko deconstructive. Wannan shi ne saboda masu ilimin ƙasa sun fi damuwa da hanyoyin erosional da yanayin yanayi.

Masanin ilimin ƙasa Richard Huggett ya lissafa paleosurfaces a matsayin ɗaya daga cikin rarrabuwa daban-daban na paleoplains.

 Dubi kuma 

 Cryoplanation surface - Samun filayen, terraces da pediments a cikin yanayin periglacial

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