For example, the similarities between the sand grains and the type of cross-bedding in some Permian sandstone and those in sand dunes in the Sahara today (indicate) ______________ that 270 Ma ago, those sands (deposit) ______________ 
(the similarities between the sand grains and the type of cross-bedding in some Permian sandstone and those in sand dunes in the Sahara; indicate; )
the similarities between the sand grains and the type of cross-bedding in some Permian sandstone and those in sand dunes in the Sahara
indicate