In the inner part of the formation with the numerous small circles and triangles, I count 64 elements. Human DNA has 64 codons. That circle could plausibly be interpreted as referring to our terrestrial, human DNA, which is frayed and degraded, in internal disarray. Names like Chernobyl, Fukushima, Nagaski, Hiroshima, Los Alamos, Nevada Test Site, Hanford, Washington, etc. come to mind as contributing factors to our genetic decline.

Around the outside are 23 more circles and triangles. This represents half of the normal number of human chromosomes. This half of the formation may be referring to a human gamete (sperm or egg), which carries 23 chromosomes, half the genetic information needed to create a baby.

BUT -- in between the two, large, circular parts of the formation is a connecting series of 13 small circles. The other, large circular array is much more featureless, other than an F-like key feature on the outside.

"F" for, well, you know, the well-known English word, F*** ?  As in copulation, the union of two gametes to form a new being? Is our degraded genome to be joined with another genome whose precise composition is left blank here?

Frogs have 26 chromosomes and, hence, have 13 chromosomes in their gametes (sperm and egg cells).

Does the formation perhaps intimate that the human genome will be upgraded with the addition of 13 additional chromosomes from an unknown, featureless, anonymous source, an anonymous  source that may (or may not) be an amphibian species? I have no idea, I simply raise the question.

Here is an illustration of a string of toad eggs.

http://www.frogsnotcanetoads.com.au/images/gallery/toad_eggs/toad_eggs_1.jpg

There is more than a passing resemblance to the linear arrangement of 13 circles between the two large circles in the Marocchi formation.

Can Mr. Collie perhaps tell us if he spies any amphibians in the features of the landscape around this formation, or any nearby references to breeding or hybridization, any ponds, wetlands, genetic laboratories, etc.?

Is the Marocchi location perhaps an allusion to the Marocchi brand of shotguns? There is a very gun-like copse at the end of the formation. Here is a nice photo of a sawed-off shotgun that very closely resembles the copse at the end of the formation.

http://img3.wikia.nocookie.net/__cb20111124193621/uncharted/images/6/6d/Sawed-Off_Shotgun.png

Are we to be party to a "shotgun" marriage between terrestrial humanity and another species? Is our DNA soon to be mixed and matched with that of another, with or without our permission?

I do not know. I simply raise the question as one possible interpretation of this formation. Obviously, there could be other interpretations, maybe multiple interpretations and meanings