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stratigraphy
Στρωματογραφία

the stratigraphy of the hydrogeological layer;
το στρατηγράφημα του υδρογεωλογικού στρώματος·

"stratigraphy, structure, and graptolites of an ordovician and silurian sequence in the terra cotta mountains, alaska range, alaska" geological survey professional paper 1555.
"stratigraphy, structure, and graptolites of an ordovician and silurian sequence in the terra cotta mountains, alaska range, alaska" geological survey professional paper 1555.