http://www.engineering.uiowa.edu/~cfd/gallery/images/flo12.jpg
http://www.uraniumminerals.com/Notes/Images/Lava.jpg
http://www.astro.umd.edu/~miller/Gallery/earth/lava.jpg
Aerial lava flows can be distinguished from aquatic ones, due to the cooling effect of water. One particularly spectacular example is columnar basalt:
http://www.geos.ed.ac.uk/geography/hutton/basalt.jpg (warning, huge image)
http://www.geograph.org.uk/photos/03/80/038009_ecbb201a.jpg
It's typical for lava flows which cooled on dry land.
This means that such columnar basalt should not be found in strata which supposedly was laid down by the flood. But we do find it in a multitude of strata. E.g. there is such basalt in the upper cretaceous in the Yukon region.
These are some more examples of such basalt covered by some more sediments...too many sediments for it to be post flood, and it's clearly above anything that can be called pre flood:
Miocene basalt:
http://www.cwnp.org/basalt.jpg
http://volcanoes.usgs.gov/yvo/images/20010521-srb-130_large.jpg
Huge but very cool:
http://www.cas.sc.edu/geog/gsgdocs/images/GSG_CD/ColunarJointing.jpg
Tertiary Columnar Basalt is found in The Giant’s Causeway, NE Antrim
(the brownish layer in particular)
Tertiary Columnar basalt is also found at Fingal's Cave off Mull (UK).
Neogene to Quaternary Columnar Basalt in Mongolia.
Carboniferous Columnar Basalt: Largo Law in Scotland
So all these strata were exposed to air when the lava flows formed, i.e. not they didn't form during a global flood.
http://www.uraniumminerals.com/Notes/Images/Lava.jpg
http://www.astro.umd.edu/~miller/Gallery/earth/lava.jpg
Aerial lava flows can be distinguished from aquatic ones, due to the cooling effect of water. One particularly spectacular example is columnar basalt:
http://www.geos.ed.ac.uk/geography/hutton/basalt.jpg (warning, huge image)
http://www.geograph.org.uk/photos/03/80/038009_ecbb201a.jpg


It's typical for lava flows which cooled on dry land.
This means that such columnar basalt should not be found in strata which supposedly was laid down by the flood. But we do find it in a multitude of strata. E.g. there is such basalt in the upper cretaceous in the Yukon region.
These are some more examples of such basalt covered by some more sediments...too many sediments for it to be post flood, and it's clearly above anything that can be called pre flood:

Miocene basalt:
http://www.cwnp.org/basalt.jpg
http://volcanoes.usgs.gov/yvo/images/20010521-srb-130_large.jpg
Huge but very cool:
http://www.cas.sc.edu/geog/gsgdocs/images/GSG_CD/ColunarJointing.jpg

Tertiary Columnar Basalt is found in The Giant’s Causeway, NE Antrim

Tertiary Columnar basalt is also found at Fingal's Cave off Mull (UK).
Neogene to Quaternary Columnar Basalt in Mongolia.
Carboniferous Columnar Basalt: Largo Law in Scotland
So all these strata were exposed to air when the lava flows formed, i.e. not they didn't form during a global flood.