| A graben is a down-dropped block of the crust resulting from extension, or pulling, of the crust. |
| He also questions the stratigraphy of the graben and the timing of north-south extensional tectonics. |
| It has been previously reported that because of extension of the outer arc of such anticlines, graben form above their crests. |
| The area is characterized by a series of low-relief Jurassic horsts and graben. |
| Earlier workers typically regarded the Messaras basin as a simple east-west-trending graben. |
| Valleys formed in grabens are commonly called rift valleys and may exhibit features of vulcanism often associated with graben formation. |
