Of five cairns at Morfa Bychan, four have burial chambers, these are:
A - at SN22120744, Dat Prn3822;
B - at SN22130748, Dat Prn3823;
C - at SN22150755, Dat Prn3824;
D - at SN22150762, Dat Prn3825.
A further cairn, noted at SN22150749, Dat Prn4314, may be simply an unstructured heap.

(source Os495card; SN20NW3)
RCAHMW AP94-CS 0301-6
RCAHMW AP945040/54-5
J.Wiles 05.3.02