Convection is produced by the inside being hot and the outside being cold. It is a long term process that will not be greatly influenced by impacts.
Needs stats. If 90% of cave art had the same arrangements of fingers then you may have a point. If these are all the pictures that have this arrangement out of the thousands we have found then it is not very strong evidence.
These were very large impacts depositing highly radioactive metal rich planetismal-sized objects in the upper mantle and they've been sinking deeper toward the core and we can see them with seismic waves. Or maybe they're something else, but we can see from the Moon, impactors large and dense enough will not just leave a mark on the surface but plunge thru the crust into the mantle perhaps pancaking like a bullet and sinking toward the core.
I dont know if they got the dating down yet for the dino killer and Deccan traps in India but they appear to have been on opposite sides of the planet at the same time and that rock was 6 miles wide. Imagine a 200-600 mile wide rock, imagine several followed by a rain of smaller chunks in the 10-50 mile wide range.
The rock that created the Imbrium basin on the Moon (the man's right eye) with a glancing blow is now estimated to be 150-180 miles wide and that was 3.8 bya. The Aitken basin near the south pole created 4 bya left a blob of dense material about 5x the size of Hawaii's big island in the mantle. Compare the differences in lunar elevations between the Aitken basin and the highlands to the north, thats a lot of crust taken out by that impactor.
Thats why we have so much trouble finding Earth's original rock. Researchers dated the Earth based on meteorites, we haven't found terrestrial rock that old (many meteorites are Earth's lost crust). This led the experts to think the Earth was a primordial hell the first ~1/2 billion years, they even called it the Hadean period because the surface was believed to be molten.
But they were wrong, the Earth had surface water as far back as 4.3-4.4 bya not very long after the impact that gave us the Moon. The water may have even preceded that collision, recent research says the Earth formed surrounded by water. The oldest terrestrial 'rock' we've found are mineral zircons dating back 4.3-4 bya and they formed in water. That poses a problem, we've been told the Earth couldn't form this close to the Sun with all this water so they've been trying to import our water with comets and asteroids hitting the Earth after it formed here.
As I recall from an article I read about these dense blobs in Earth's mantle, one was under Africa and the other was under the Pacific. I think these are the remnants of impacts with large objects. These impacts were long after the planets swept up material, so researchers argue the migrations of outer planets caused 'the late heavy bombardment'. Which is interesting given how various myths/religions describe the period before the creation of Heaven and Earth and life itself as chaotic, the Enuma Elish even says the divine brothers banded together disturbing Tiamat.
https://scitechdaily.com/two-massiv...-scientists-with-their-surprising-properties/
Within the mantle, there are two massive blob-like structures, roughly on opposite sides of the planet. The blobs, more formally referred to as Large Low-Shear-Velocity Provinces (LLSVPs), are each the size of a continent and 100 times taller than Mt. Everest. One is under the African continent, while the other is under the Pacific Ocean.
The two may have different densities, the one under the Pacific is 600+ miles lower.
As for rock art, not every image will convey the same information. For example, the image I posted earlier of the Incan depiction of Viracocha shows him to be an ellipse between 2 sets of celestial objects in groups of 4 and 5. There are many images on the panel that do not depict Viracocha. The Nazca monkey is an earlier version of Viracocha as he stares down between two paws with 4 and 5 digits. The Nazca 'bird' with 4 and 5 digits is another example.
In the 9 Mile Canyon panel the horned deity in the top row has 5 sheep to its right and 3 to its left, that shows us the solar system before creation, before the warrior lower and right of the top row slays the horned deity. After the celestial battle the remains of the horned deity move left in the row and the warrior occupies that location and returns to whence it came, captured into an elliptical inclined orbit with perihelion between Mars and Jupiter.
The Toltec conception of the cosmos was 9 Lords ruled the night but there are 13 levels of Heaven - their creator occupies 2 levels in Heaven. Combine this with the 9 Mile Canyon creation story we can see their creator has an inclined elliptical orbit with perihelion between (or above) Jupiter and Mars. Thats why our solar system is tilted, this other planet has dragged everything off the Sun's equatorial plane. This tilt has been mentioned by 9th planet researchers as evidence for their theory.
Here's the post with images of the creator and creation
https://forums.civfanatics.com/threads/atlantis-what-is-it-all-about.674625/page-9#post-16231388
