PORTH Y POST

Porth y Post is a small bay on the western coast of Holy Island in Anglesey, North Wales.  The 1:50000 O.S.

map for this area is sheet 114 (Anglesey) and the grid reference for the locality is SH 244796.  The BGS map

sheet to refer to for this locality is the Anglesey sheet.

The rocks investigated in the video clip for Porth y Post are dykes of Tertiary age that have been intruded into

tightly folded schists of the Precambrian New Harbour Formation.  The gallery illustrates some of the

characteristic features of dykes such as cross-cutting relationships, chilled margins, cooling joints and baked

margins.

SPONSORED BY THE PETROLEUM EXPLORATION SOCIETY OF GREAT BRITAIN

PORTH Y POST

Porth y Post is a small bay on the western coast of Holy Island

in Anglesey, North Wales.  The 1:50000 O.S. map for this area is

sheet 114 (Anglesey) and the grid reference for the locality is

SH 244796.  The BGS map sheet to refer to for this locality is

the Anglesey sheet.

The rocks investigated in the video clip for Porth y Post are

dykes of Tertiary age that have been intruded into tightly

folded schists of the Precambrian New Harbour Formation. 

The gallery illustrates some of the characteristic features of

dykes such as cross-cutting relationships, chilled margins,

cooling joints and baked margins.

Sponsored by P.E.S.G.B.

J O I N T   P R O J E C T

J O I N T   P R O J E C T