laurentian shield

17 LETTERS · STARTS WITH L

laurentian shield is a valid 17-letter word worth 20 points in Scrabble and 24 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

L1A1U1R1E1N1T1I1A1N1S1H4I1E1L1D2

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 1 + 1 + 1 + 2 =20 PTS

DOUBLE WORD → 40TRIPLE WORD → 60

MEANING

What does laurentian shield mean?