It is the enigmatic nature of the features of the later ruts which
has resulted in the discussion of the 'cart-rut' phenomenon. The individual
characteristics of both trails are here discussed and compared.
Feature 1- Area
between the ruts
The area lying between the rut pair in the 'modern' ruts is often lower than the surrounding terrain (as shown) or else marked by grooves or hollows with an axis perpendicular to the ruts and attributed to the passage of the person or animal pulling/pushing the vehicle.
In contrast the terrain between the ruts in the 'ancient' examples
appears not effected by the presence of the ruts. This raises a question
on what and how was the vehicle on the ruts moved.
Feature 2- Inter-rut variability
'Ancient' ruts are also characterized by a variable inter-rut distance attributed to wobbling of the part of the vehicle touching the ground. This explanation, however, provides a limitation to the maximum load that such proposed vehicle would carry.
"Modern' ruts maintain a constant distance between the trails.
Feature 3 - Outer edge of Rut
The outer edge of 'ancient' ruts may exhibit a splaying outwards,
a feature which has until now escaped an explanation. This is not
present in the 'modern' ruts.
Feature 4 - Rut profile
The profile of 'ancient' ruts is 'V' shaped in contrast with 'modern'
ruts which have a 'U' shaped profile.
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