Attention was paid to the origin of microscopic flow-banding since micro-cracks that form during cooling open up the rock and make it poorly resistant to weathering which is a well known property of dolerite.
Upphaf straumflögunar í grágrýti er sérstaklega gefinn gaumur því örsprungur, sem myndast í fíngerðri straumflögun opna bergið og lækka veðrunarþol þess en grágrýti þykir sérlega viðkvæmt fyrir frostveðrun.