| shales) |
| | | | limestone | | |
+----------------+--------------------+---------------+--------------------+---------------------+---------------------+
| Lower Cambrian | Harlech grits and | Caerfai group | Lower Comley | Hollybush sandstone | Upper Hartshill |
| _Olenellus_ | Llanberis slates | | limestone | with Malvern | quarzite. |
| fauna | | | | quarzite and | _Hyolithes_ shales |
| | | | | conglomerate at | and limestone |
| | | | | the base | |
| | | | Wrekin quarzite | | Middle and lower |
| | | | | | Hartshill quarzite |
| | | | | | and the quarzite of|
| | | | | | the Lickey Hills |
+----------------+--------------------+---------------+--------------------+---------------------+---------------------+

_Scandinavia_.--Here the Cambrian system is only distinguished clearly
on the eastern side, where the three subdivisions are found in a thin
series of strata (400 ft.), in which black concretion-bearing shales
play an important part. Limestones and shales with the _Euloma-Niobe_
fauna come at the top. The upper series (_Olenus_) has been minutely
zoned by W.C. Brogger, S.A. Tullberg and J.C. Moberg. In the middle
series (_Paradoxides_) three thin limestone bands have been
distinguished, the Fragmenten-Kalk, the Exulans-Kalk and the
Andrarums-Kalk.

On the Norwegian side the Cambrian is perhaps represented by the Roros
schists which lie at the base of a great series of crystalline
schists, the probable equivalent of Ordovician and Silurian rocks.

_Baltic Province._--The Cambrian rocks in this region are nearly all
soft sediments, some 600 ft. thick; they reach from the Gulf of
Finland towards