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зигенский
 зигенский
geol. Sig; Siegenian
| ярус
 ярус
gen. circle; layer; horizon; storey; story; assise

to phrases
зигенский adj.stresses
geol. Sig (MichaelBurov); Siegenian (MichaelBurov)
зигенский: 18 phrases in 4 subjects
Geochronology5
Geology9
Oil / petroleum1
Stratigraphy3