Which of the following is not correct about Vindhyachal range?

The question asks which statement is NOT correct about the Vindhyachal (Vindhya) Range. The Vindhyas act as a water divide between the Ganga drainage to the north and the Narmada drainage to the south, so that statement is correct. The range is a discontinuous chain of ridges, escarpments and plateau edges rather than one continuous high range, so 'it is not a continuous high range' is also correct. Its southern face, overlooking the Narmada rift valley, is a steep escarpment, so 'southern slope is steep' is correct as well. However, the range is NOT made of Vindhyan (sedimentary) rocks throughout its entire length: while sandstones of the Vindhyan Supergroup dominate the western and central parts, the eastern sections include crystalline rocks such as granite, gneiss and schist. Therefore the statement 'This range is composed of the Vindhyan rocks in its entire length' is the one that is NOT correct.