It shows a vertical section through the strata from Aynho to King's Cliffe (line A to B on the map), and ignores the many river valleys and other topographical features.

Various sedimentary rocks were laid down over the Middle Jurassic Epoch during periods of shallow seas and deeper oceans, in what is now Northamptonshire, creating the Oolitic limestones, sandstones and ironstones found across the length of the county.

In the case of the Stamford Member, this was a freshwater lake on the coastal plain of an area of higher ground[5] dubbed the Anglo-Belgian Landmass.

This was a much shorter period than the earlier unconformity, however, and with further deepening of the seas across what is now north-west Northamptonshire, the Finedon Quarry area became a brackish lagoon.

The resulting rocks of the Wellingborough Member have rhythmic strata of Limestone often with great quantities of oyster shells, interspersed with rootlet beds as the land emerged or submerged.

The beds are named after a village with extensive quarries south of Northampton, where it was studied at the end of the 18th century whilst the Blisworth Tunnel was being built for the Grand Union Canal.

This would place it in the Retrocostatum Biozone and it is inferred to belong to what are known as the 'Diginoides Beds', although the diagnostic brachiopod fossil Digonella digonoides has not been found at this outcrop.

This zoning suggests no deposits from the intervening Bremeri Biozone, implying either no sedimentation or a period of erosion between the Sharpi and Diginoides beds.

Since active quarrying stopped its base has acquired a build up of material obscuring the lower beds, and a substantial linear pond lies along the length of the outcrop.

The narrow-gaugeWellingborough Tramway took the ore from this and numerous other nearby quarries to the furnace sites and railway sidings north-east of Wellingborough.

The early quarries had moved all the excavated rock by hand, loading it into wheelbarrows and pushing it via planks suspended over the trench, to be dropped on the far side.