The first lintel of the inner passage
section.
A progression of these edge-set lintels continues back from this stone, roofing
most of the length of the inner passage.
The walling above the lintel is the facing of the cairn core, the joints on
either side are where the primary casing meets this.
Unlike some tombs of this type, the passage walls do not show a joint at the
point where the casing meets the core, the walls
cross the transition line without visible interruption.