Thanks to the help of an independent researcher, I have been able to find some more information about the Throckmorton burials.
Recall that nine pits were dug, but only six were used. This can be seen in this aerial photo of the burial site from 2002:
It is also specified in this diagram of the site:
Note that a large support area had to be used in addition to the actual grave space. Here is the current appearance of the site. The location of the pits that were used can be identified from the darker green coloration of the grass.
Using the scale given and pixel counting, it appears that the burial area proper – i.e. the line of graves and nothing else – has an area of around 1.36 hectares. [Including the support areas that were also dug up, the total area involved is around 13.5 hectares; as only 6 out of the 9 pits were used we can reduce this figure by a third, to 9 hectares.] Recall what was buried at Throckmorton:
Assuming jews weigh 50 kg this 13,572,000 kg corresponds to 271,440 jews. Assuming that the same burial efficiency as at Throckmorton, the necessary grave area for a single line of graves would be:
Belzec: 434,508 jews in 2.18 hectares (roughly 4 times what Kola claims to have found)
Treblinka: 760,000 jews in 3.81 hectares (Sturdy Colls claims to have located pits with surface area 0.35 hectares)
Of course, this does not include necessary area for holding the excavated soil or for other supporting tasks. It also is only applicable to the configuration of a line of graves, for the reason that a line of graves can be accessed from either side, while in a more complex configuration of graves considerable space needs to be left in between the graves due to the geometry as well as for logistical reasons.
Here is Treblinka juxtaposed with Throckmorton, to scale:
With assumptions as above, Treblinka buried 760,000/271440 = 2.80 times the (equivalent) number at Throckmorton. As those which died on the trains would be buried outside the upper camp, the number which would have had to fit into the upper camp would have been slightly less, something like this:
According to Peter Laponder’s map, the upper camp had an area of 4 hectares. (There’s a little uncertainty in this figure as exactly where to the put one of the boundaries is unclear, since Laponder indicates a large sandpile as forming a boundary. The controversial bloggers claim an area of 4.139 hectares, but this is because they have erroneously included the Lazarett in the upper camp.) While the 3.81 hectares (less whatever fraction died on the trains or in the Lazarett) required for the alleged burials at Treblinka is less than the size of the upper camp, it is only barely so. Once one accounts for the portion of the upper camp that remained forested (hence not used for a large grave!), the area taken up by the gas chambers and barracks and cremation pyres, the fact that plane arrays are inherently less efficient than graves in a line, the fact that the sand removed from the graves would have taken up space* (at least as much space as the graves themselves), and so on, then the upper camp is plainly far too small to hold the requisite number of bodies.
(*) If anti-revisionists want to argue that the soil removed from the graves was trucked away, they then need to answer the question of how the soil was levelled again. If 100,000 cubic meters of soil were trucked away from Treblinka, that would have left a 1 hectare pit 10 meters deep, or a 5 hectare pit 2 meters deep, and so on. The ashes from the cremation would have filled only a fraction of this. An explanation of why the Russians didn’t find such an enormous pit when they captured Treblinka is required. Presumably anti-revisionists would assert that new sand was trucked in – but from where? Is there any evidence for this large scale operation? Did none of the witnesses notice the tens of thousands of truckloads of soil that would have had to come in over the course of a few months? If anti-revisionists hope to claim that the pits were filled in after the Treblinka revolt, so that the witnesses would not have noticed, they will have to explain why witnesses claimed that the pits were completely smoothed over before the revolt. Moreover, soil trucked in from elsewhere should be identifiable with soil tests, or even by a casual inspection of the site, but I am unaware of any evidence of this nature for such an enormous amount of delivered soil.