Les Placodermes, Arthropodes et Lycophytes des grès dévoniensde Dô Son (Haïphong, Viêt Nam)

The oldest flora of the South China Block, and the stratigraphic bearings of the plant remains from the Ngoc Vung Series, northern Vietnam

“…Fossils are found in clay and siltstone lenses, mostly at Dô Son. They are mainly eurypterids (Janvier et al, 1989;Braddy et al, 2003), but placoderms, lingulids and early land plants fragments are also common (Janvier et al, 1987). Sedimentology suggests that the Van Canh Formation represents alluvial channels in a deltaic system, with a slight marine influence in Dô Son, as suggested by the presence of eurypterids, acritarchs and scolecodonts (Braddy et al, 2003).…”

Constraints on Siluran and Early Devonian phytogeographic analysis based on megafossils

“…Better documentation of both fossils and age determination is required. The plant assemblage in typical Old Red Sandstone sediments in adjacent northern Viet Nam (Janvier et al 1987) contains axes with isotomous, anisotomous and Hbranching and one with some evidence for spine bases. Isolated sporangia range from rounded to oval to reinform in shape with the latter possessing a border.…”

A Late Devonian refugium for Colpodexylon (Lycopsida) at high latitude

“…Lower Frasnian of Columbia (Berry et al, 2000). Equivocal reports of Colpodexylon include a stratigraphically poorly constrained example from Vietnam on which trifurcate leaves were not clearly demonstrated (Janvier et al, 1989), Plate III. Colpodexylon mergae sp.…”