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proto-Thames
proto-Thames n.
Brit. 
/ˌprəʊtəʊˈtɛmz/
, /ˌprəʊtəʊˈtɛmz/U.S. /ˌproʊdoʊˈtɛmz/
Geography the Thames at an early stage of its development as a river./ˌproʊdoʊˈtɛmz/ΚΠ
1927 Geogr. Jrnl. 70 389 Towards the close of Pliocene times the Proto-Thames must have occupied the centre of the now abandoned Diestian sea bottom.
1983 Proc. Geologists' Assoc. 94 85/2 Roadworks..provided an unusually favourable opportunity to examine gravel deposits of the proto-Thames valley in a transect across its northern flank.
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