An extract from Morris, L., 1748. Plans of Harbours, Bars, Bays and Roads in St. George's Channel. The extract (page 48) describes the coverage of the herring fishery into Caer Wyddno.

The extract reads as follows: “Here is a Ridge of shole Ground from this to Gwallog, called Sarn Gynfelyn, which makes the Bay of Aberystwyth, and covers the Herring-fishery.”