Falling Rocks

Oh, no! The rocks are falling down! All rocks are either horizontal or vertical and consist of four or more stones. Figure out what remains after all the rocks have fallen.

R E A
U S R G
E B E R T
Y Y C I M
O O I L D
L P F M C L
H E F U H A
U B U A A R
A B V L L E
N L T T Z M E
A A R F L I N
R C A P P H I R
Q S I D I S B O E
N O E T S E E I T
E A L D P K A T L
C L E L B R A M E