126 
RED AND NORWICH CRAGS. 
known as ‘ Blake’s Pit/ to which Mr. J. Reeve directed attention 
in 1870. The Crag here is often called the ^ Scrobicularia bed’ 
from the abundance in it of Scrobicularia plana. Mr. S. V. Wood 
says it ‘ appears to intervene between the few feet of specially 
Fluvio-marine Crag which rests on the chalk and the Chillesford 
bed.’ For my own part I cannot recognize such a distinction. 
Blake’s pit shows a mass of shells and sand from top to bottom, 
with included streaks of clay. The Scrobicularia so abundant 
here is very rare in the adjoining exposures on the Common. 
Many of the shells are highly stained with iron-oxide in Blake’s 
pit, and present quite the appearance of Red Crag fossils.” East 
of Bramerton the Chalk disappears beneath the marsh level, but 
shelly Crag can be traced for about one and a half miles further. 
In 1873 Mr. Gunn drew attention to the discovery of a Masto¬ 
don’s tooth in the beds in a pit near Surlingham Wood. The 
following was the section then recorded :— 
Feet. 
7. Gravel, from which a Neolithic implement was taken. 
6. “ First-rate Chillesford Olay ” - - - - 10 
6. Bright yellow sand in which the tooth was found - - 3 
4. Bed gravel. 
3. Lighter coloured clay with large interspaces of sand, 
beautifully laminated - - - - - 8 
2. ‘ ‘ Chillesford Clay ” more compact, and the lower part of 
a darker bright blue colour - - • - 10 
1. Fine sand in which shells were found 6 feet below the clay. 
Associated with the tooth were broken fragments of a leg bone 
of the Mastodon or Elephant. The tooth bore a matrix of dark- 
coloured gravel and sand, thus differing from the sand in which it 
was found, Mr, Gunn considered that it was derived from the 
Stone Bed. 
The following was the section of the pit when Mr. Woodward 
visited it in 1877. 
Fig. 30. 
Section at Surlingham Wood, 
Upper Crag 
Feet. 
5. Warp - - - . - 2 to 3 
'4. Brown clay, sand, and gravel, contorted 5 
3. Sand in which bones had been found - 1 to 2 
2. Laminated clay and sand - - 10 to 12 
.1. White false-bedded sand. 
