In Northern Ireland there are many layers of Tertiary age basalt.
http://www.geographyinaction.co.uk/G...eol_index.html
Between these layers of basalt are beds of laterite a product of the chemical weathering of basalt:
an example from Antrim (1) the laterite is the red layer.
These beds can be extremely thick reaching a maximum depth of 30m. The chemical alteration of the rock needed to form a thick layer of laterite takes a long time (approx 1-2 million years (2)) and does not happen underwater. The surface environment is also confirmed by a lack of pllow lavas (diagnostic of underwater basalt eruption) and fossilised tree roots found in these paleosols:
http://www.habitas.org.uk/fossils/basalt.html
falsifications of the flood in this formation:
1) time needed to form the laterite
2) lack of pillow lavas in the basalt (not erupted underwater)
3) evidence of trees growing between lava flows (long time between eruptions - consistant with presence of laterite and surface eruption of basalt)
(1) Piotr Migon, Karna Lidmar-Bergstrom. Weathering mantles and their significance for geomorphological evolution of central and northern Europe since the Mesozoic. Earth-Science Reviews 56 2001 285–324.
(2) I.G. Hill, R.H. Worden, I.G. Meighan. Geochemical evolution of a palaeolaterite: the Interbasaltic Formation, Northern Ireland. Chemical Geology 166 2000 65–84.