Monument type
Roman, later also Visigothic city in Spain with two city walls.

Survey data
Area investigated: 10.500 m2
Resolutions: 4 MP/m2 (a = 0,56 m) : 10.500 m2

Array configuration: Twin-probe
Measuring instruments: Lippmann 4point light MC and 10W
Imaging software: SURFER (Golden Software)
Survey period: 03. 2018

Comments
During the measurements carried out in March 2018, which aimed, among other things, at clarifying the presumed location of the Visigothic city wall, it turned out that the previously assumed course of both, the Roman and Visigothic walls, has to be reconsidered.

The survey area 1 shows the western section of the early medieval wall, also known from earlier geophysical surveys, and its continuation in a north-northeast direction.

The measuring surface 2 confirms the continuation of the wall in the same direction with a new approx. 20 m long section.

The almost empty measuring surface 3 largely excludes a turning of the wall to the north and at the same time shows a short, massive foundation section at its southeastern corner, which indicates a piece of the city wall passing by here.
Thus, the measuring surfaces 1 - 3 initially confirm the previously assumed Visigothic course of the wall.

The fourth measuring surface raises questions:

Following its previously assumed course, the eastern Visigothic Wall, which was detected in earlier geophysical surveys, approaches from the south-southeast, should turn west approximately in the southern part of the fourth survey area. However, this is not the case. Instead, it continues on a distance of over 100 m to the northwest. The only recognizable junction could still be about 75 m further northwest (arrow), but there seems to have been no evidence of this in the adjacent excavation areas to the west...

=> Where does the Visigothic wall turn west?
=> Where does the newly prospected, 100 m long section of the wall lead to?
=> Could this possibly be the Roman city wall?
=> How safe is the proof of the assumed parallel Roman city wall?