The Thames
Long Wittenham, at Wallingford, at Streatley, at Pangbourne, and, still lower, at Maidenhead and at Ealing, this hard soil came right down to the bank, upon either side.
On all this lower half of the Thames marsh was rare, and was to be found even in early times only in isolated patches, which are still clearly defined. These are never found facing each other upon opposite banks of the stream. Thus there was a bad bit on the left bank above Abingdon, but the large marsh below Abingdon, where the Ock came in, was on the right bank, with firm soil opposite it. There was a large bay, as it were, of drowned land on the right bank, from below Reading to a point opposite Shiplake, the last wide morass before the marshes of the tidal portion of the river; and another at the mouth of the Coin, above Staines, on the left bank, which was the last before one came to the mud of the tidal estuary; and even the tidal marshes were fairly firm above London. From Staines eastward down as far as Chelsea the superficial soil upon either side is of gravels, and the long list ot ancient inhabited sites upon either bank show how little the overflow of the river interfered with its usefulness to men.
The river, then, from Sandford downward has afforded upon either bank innumerable sites upon which a settlement could be formed.
Above Sandford these sites are not to be found indifferently upon either bank, but now on one, now on the other. There
