section_heading: Stratigrafska podjela i GSSP
paragraph_text: Globalna stratotipska točka (eng:Global Boundary Stratotype Section and Point - GSSP),Cocks, L.R.M., Woodcock, N.H., Rickards, R.B., Temple, J.T., and Lane, P.D., 1984. The Llandovery Series of the Type Area. Bulletin British Museum of Natural History (Geology), 38, broj 3, str. 131. - 182.