162 The Official Guide to the 
models of the eggs of another extinct bird, the 
Epyornis, found in superficial deposits on the Island 
of Madagascar. 
The most important collection in the geological 
department is that which very fairly and fully illustrates 
the geology of the Eastern Counties, the Pliocene 
deposits, which extend far and wide, in varying 
thickness, over the Eocene and Cretaceous Series. 
The Pliocene comprises beds of Crag—Coralline 
Crag, Red Crag, Norwich Crag—Chillesford Sands 
and Clays, and the Forest Bed Series. In Table 
Cases 5 and 6 will be found fossils from the Suffolk 
or Coralline Crag, which consists of a series of 
calcareous shelly sands, sometimes marly, having a 
thickness of from forty to sixty feet. ‘The Coralline 
Crag was so called because it was supposed to be 
rich in fossil corals, which, however, proved to be 
folyzoa, organisms allied in character to our common 
sea mats. ‘This formation is remarkable, not only for 
its large percentage of extinct shells, but also for the 
presence of Southern forms, such as are now found 
in the Mediterranean area. Below the Red Crag 
formation there occurs a bed with rounded phos- 
phatic nodules, septaria, water-worn teeth, bones 
of land animals, and also parts of whales and of 
the enormous shark called Carcharadon megalodon. 
Specimens of these are shown in Table Case 5. 
The Red Crag, a dark-red shelly sand, sometimes 
yellow, brown, or grey; it is well shown at Walton- 
on-the-Naze, Sutton, Bawdsey, etc. The Red Crag 
contains fewer shells of species now living in the 
‘Mediterranean and warmer latitudes. The fossils 
of the Red Crag include Fusus, Pecten, Mactra, Tellina, 
Cardium, Mytilus, Nassa, Buccinum, Naiica, Purpura, 
Li urritella, etc. 
The Norwich Crag (Table Case 6) which is to be 
