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[[image - pencil sketch of cross section of ground showing various strata and labelled as follows]] 
Section at Straile's Glen 
Genesic Shales
Spring Branch
20° + 1' ^ Trilobite
4° + 2' Limestone
1° Shale
3° + 2' Base of Limestone 
Shaly, about a foot.
5° + 8' Hamilton Shales
Hamilton Shales 
Spring Branch
[[image - arrow]]