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Examples of Glaciation
A similar condensation takes place at the bottom as the result of the work of gravity: a harder core will form.
If you look at some small drift piled up, maybe, against the glass pane of a storm window, you can plainly see how the snow, even in such a miniature pile, preserves the stratified appearance which is the consequence of its being laid down in layers of varying density.
In the Bala and Caradoc beds the trilobites reach their maximum, being represented by 111 species referred to 23 genera.
While on this subject, it may be useful to the student to know that a Brachiopod differs from ordinary bivalves, mussels, cockles, etc., in being always equal- sided and never quite equi-valved; the form of each valve being symmetrical, it may be divided into two equal parts by a line drawn from the apex to the centre of the margin. TRILOBITES.
Marine Shells of Moel Tryfaen.
Rarity of Organic Remains in Glacial Deposits.