In the frozen north?

A short while ago we were in the bottom pointy bit of the theatre field. We are now in the top pointy bit! We have surveyed with the mag a substantial proportion of the field. A quick check with QGIS shows that we have surveyed 17.3 hectares of a 27.3 hectare field.  Good job everyone.

To start, let us see the overall progress.

The area surveyed after day 18.

The area surveyed after day 18.

The northern area has some very interesting features.

Detail of the northern area.

Detail of the northern area.

The sinuous ditch continues westwards up the dry valley towards the wall.  A basic aquaduct seems a good possibility.  Less Pont du Gard and more muddy ditch, as aquaducts in Britannia tended to be.  There are also quite a few small and quite faint ditches which look like small field boundaries.  Perhaps evidence of agriculture outside the town when the ‘1955 ditch’ was the boundary and before the wall was built?

There is a nice find in the topmost area.

A building parallel to the road just inside the Chester gate.

A building parallel to the road just inside the Chester gate.

A rectangular building can be seen a little back from the line of Watling Street just inside the Chester Gate.  Snack bar or tax office?  This will be a nice building to target with the GPR… next year!

On the subject of GPR, the crew managed a 20×40 block with the large 160mhz antenna, and two 40x40m  blocks with the usual 450mhz antenna.  Here are the time slices from the two blocks with the 450.

The more southerly block of GPR data. The slices are 8-12, 12-16, 16-20 and 20-24ns.

The more southerly block of GPR data. The slices are 8-12, 12-16, 16-20 and 20-24ns.

The more northerly block of GPR data. The slices are 8-12, 12-16, 16-20 and 20-24ns.

The more northerly block of GPR data. The slices are 8-12, 12-16, 16-20 and 20-24ns.

An excellent result showing a whole series of buildings.  Joining up the 16-20ns slices in Google Earth we can see how they relate to the magnetic data.

The day 18 GPR blocks overlaid on the magnetic data.

The day 18 GPR blocks overlaid on the magnetic data.

The same area as the previous image for comparison.

The same area as the previous image for comparison.

And finally for this evening, the context of those GPR blocks.

The GPR results around the day 18 data.

The GPR results around the day 18 data.

Quite an impressive series of buildings in the heart of the town.  Clearly, expanding the GPR survey next year will be well worth the effort.

The weather for tomorrow, our final day, is somewhat uncertain.  We will see…

 

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