98 
RED CRAG. 
from the Eed Crag. If for IJ we read |, there is a pit which 
might have once shown such a section: an irregular junction of 
the Red and the Coralline Crags.” 
Fig. 21. 
Section in a Pit hy the Side of the Road 1J (“^ |) mile N.N^E, 
from Sudhourn Church. 
(Prestwich. Quart. Journ. Geol, (Soc., vol. xxvii., p. 335.) 
a. Light-coloured sands with fine gravel. 
b. Ferruginous and yellow sands (Red Crag). 
c. Coralline Crag. 
A good section of the junction of the two deposits can still be 
seen in the third Crag pit (marked on the Map), north-east of 
Sudhourn Church. Here the Red Crag is very shelly, Mactra 
ovalis and Mya truncata being particularly abundant. 
■' We now enter the debatable land, where higher fossiliferous 
zones are met with, and there seems to be a distinct passage 
upwards from Red Crag to Chillesford Clay. The thickness of 
the Crag becomes also much greater, we lose the derivative 
fossils which have caused so much complication, and the beds 
become lighter in colour and more estuarine in character. The 
remainder of the Red Crag, and the Norwich Crag, will be 
described in the next chapter. 
As no representatives of the zones remaining to be described 
have yet been found in Belgium, this may be a convenient place 
to speak of the strata which crop out on the eastern margin of 
the Anglo-Belgian basin. The Red Crag being in all probability 
perfectly continuous under the bed of the North Sea, the strata 
seen in England and Belgium must be merely the littoral deposits 
of the two sides of the same narrow sea. Under these cii'cum- 
stances, if the Red Crag and the Scaldisian are contemporaneous 
we might expect a very close correspondence in their faunas. 
The upper part of the sands seen in the different excavations 
around Antwerp belongs to the Scaldisian* formation, and rests on 
a slightly eroded surface of the older beds, the junction being 
* So named after the river Scheldt (the classical Scaldis) on which Antwerp is 
situated, 
