Incorporating matching structural ridges into existing matches (orange dots)
Annotated photo of the shear line where the head broke away from the body, as described in parts 1-5. Click for hi-res. Zooming is advised.
[There are a couple of anomalous black blobs that appear to be artefacts of dots mistakenly placed and then erased. These are on site A (the flat crater) and on the neck. Please ignore these]
Green dots: shear line as described in parts 1-4
Blue dots: show matching ridges across head and body lobes. The long blue ridge across head and body overlapped at the scalloped triangle (blue dot in 2nd photo below) and incorporated the pushed-up ‘gull wings’ along that short distance. These gull wings are described in part 5 and match the gull wings directly above, under the head (not visible here).
Yellow dots: show how head cove fits to base
Red dots: point-to-point matches
Light orange dots: ‘geological’ or structural shear ridges (head lobe shows these with one large dot either end). These are not the actual shear line but ridges that were exposed by the head uplift and the uplift of two hypothesised adjoining slabs that drifted away. However, because the head uplift caused them to be exposed, the main shear line does follow both ridges for a short distance- the rest of their extent was covered by the slabs. The two ridge lines on the head match the two on the base. However this is tricky to visualise: since the head has to be tipped back 30 or more degrees to seat down on the body, it is the bottom ridge line on the head (as viewed from this shot) that fits to the top ridge line on the body. Similarly, the top ridge line on the head fits to the bottom ridge line on the body. There is also a small anticlockwise rotation needed for them to fit.
Brown dots: supposed shear line running in ‘mid air’ across missing slab area. This would be the third and largest missing slab.
Fuchsia dot: next plausible match point (mirror point on head not in shot).
Below is a similar annotated photo from a different view. This excludes the orange dots for the structural ridges since these aren’t thrown into relief as much. It also excludes the fuchsia dot (off frame to right) but includes a large blue dot to denote the centre of the scalloped triangle. You can see the two circular slurry piles which were ejected from under the scallop and which pushed up each gull wing 20 metres or more (wings only just visible from this angle). The gull wings correspond to the wings under the head which again are not visible. However, a third tier of wings is visible here. They are next to the first green dot on the head and appear to match roughly to the scalloped triangle. That is because the three tiers of wings were stacked loosely like puff pastry, one on top of the other. The true match to the scallop is pictured side-on in part 5.
The three green dots on the head correspond to the first three green dots running along the back of the ‘rectangle’ that incorporates the scalloped triangle. This short section is the subject of part one with the rest of the green dots dealt with in parts two and three.
Copyright ESA/Rosetta/NAVCAM – CC BY-SA IGO 3.0