Part 70- The Four Delaminated Layers Across the Width of Anuket.

Original- to track the lines without dots obscuring them:

Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0/A.COOPER


Red- four delaminated layers sitting along the front of the Anuket neck. They’re the same width as Anuket. 

Mauve, yellow, orange- these depict the head lobe shear line. In other words, the continuous line drawn by these colours matches the shape of the head rim, 1000 metres above. This photo was culled from part 24 which explains these matches in great detail. Hence the ‘original’ still has the colours from that part. 

Photo 2- the layers, numbered, ready for Part 71 which will have a much fuller explanation. 

Photo 3- as photo 2 but with the red triangle sides (Part 26) added.

Large red- the red triangle (Part 26, signature 5). These are just the two long sides of what is a long, thin isosceles triangle. The sharp vertex is off-frame to the left. 

These two larger-red dotted lines look bumpy from this side view. From above they are both dead straight. This is because their straightness was brought about by the tensile forces of stretch. This was when 67P was stretching as a single body before the head sheared from the body. They are tensile force lines etched on the surface. 

Specifically, they are tensile force lines which had a steep shear gradient across their width (diminishing parallel tensile force vectors across a very narrow width of ~20 metres. This caused slip-shearing of the crust on either side. Hence these delaminated layers, #1 to #4, being perfectly enclosed within the two long sides and not encroaching past them to the areas beyond the triangle. 

The base of the triangle isn’t marked in large red here because it runs along the front lip of layer #3, which is essentially the head lobe shear line. The upper (northern) perimeter of the red triangle goes through the mauve dot and continues down into Hapi. In Part 26 it stopped at the mauve dot and turned to run along the base which was then the layer #3 front lip. 

Now that the layer #1 and #2 delaminations have been found it means the base of the red triangle runs along the front lip of layer #1 which means it runs under the Anuket neck. 

Photo 4- with mini-matches added in yellow. 

Yellow- These have been matched in other photos including in Part 26. However, the pair either side of the ‘2’ and the pair above it haven’t been mentioned on the blog before. They will eventually get the close-up treatment to prove these matches do exist in finer detail. 

Photo 5- a different view of the delaminated layers. 


Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0/A.COOPER

In photo 5, we can see the front lip of layer #1 which was in shadow in the above photos. We can also see the Anuket neck and how these four layers are arranged across its width which is highly significant (see Part 57, also Part 29). You can now see how the coloured dots and lines on the body match to the head rim (Part 24).

Photo 6- as for photo 5 but with the layers numbered in the same sequence as in the other view above. 

Notice how the head lobe shear line cuts across layer #2 as the former head rim seating curves round to match the path of today’s curving head rim. 


Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0

To view a copy of this licence please visit:

All dotted annotations by A. Cooper. 


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