Note 54 — SECTION II. PHYSICAL GEOGRAPHY OF ICELAND.
Reading edition
From Stuðill, anything that steadies, a stud, prop, stay. A specific usage makes Stuðlar signify pentagonal basalt columns, and Stuðla-berg is a basaltic dyke (Cleasby). It is popularly opposed to Mó-berg, “a kind of tufa,” properly Palagonite, from Mór, a moor or peat-fuel.