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| 0123 |
Explorations in Turkestan : Expedition of 1904 : vol.2 |
Captions
| [Photo] 487 |
A Canal Gully in the Abandoned Irrigation Terraces of Anau. |
Citation Information
OCR Text
flat clay, still bare—portions of the delta isolated from the rest at different times
long past. And as they vary greatly in relation to each other, to the mother delta
and to the dunes, these areas of bare clay become of interest. In some instances
two plains separated by only a narrow ridge of dunes differ several feet in level.
Thus we have preserved in open air the ancient delta surface, various horizons of
antiquity escaped from burial.
How old these more ancient dunes around Anau are may be conjectured from
a section exposed by our shaft sunk through the ruins of the sand-buried oasis
near Ball Kuwi (see plate 69). There culture rests on hard, extremely fine, lami-
nated clay, light brown, the contact being practically on a level with the takir plain
just north and doubtless a continuation of its horizon. This clay bed is 4.5 feet
thick and rests on 1 foot of dune-sand, below which lies another sheet of clay 0.5
foot thick. From there down our shaft continued in dune-sand, cross-bedded on
a large scale and so loose that it was unsafe to go deeper, and how far it is to the
next clay layer we know not, but imagine that for great depth the structure would
be large masses of dune-sand interbedded with clay. What we did suffices to
show that here was an area where an aggrading delta surface was from time to
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