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Horn, Kullmann & Oliveira |
1989 |
New goniatite horizons at the Visean/Namurian boundary in Southwest Portugal.
Bulletin de la Societé belge de Géologie, 98-3/4: 475-481, fig.1-4, pl.1; Bruxelles
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Korn & Horn |
1997 |
The Late Viséan (Early Carboniferous) goniatite stratigraphy in the South Portuguese Zone, a comparison with the Rhenish Massif.
Newsletters on Stratigraphy 35: 97-113, 4 figs., Berlin, Stuttgart.
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