[lentulusgracchus]

My faculty advisor and department head in the 1960's had done a thesis or dissertation on these features back in the 1940's or 1950's and concluded that they represented impact cratering from a bolide that broke up in the atmosphere.

His paper had some aerial photos from the 1930's or earlier that were not nearly as overprinted with cultural development.

I believe he used torsion-balance and magnetometer data from his transits to support his conclusions. Man's name was McCampbell -- he's dead these 25 years now -- don't know if his paper was published.

[Fred Nerks]

is this anything like you are looking for?

[ForGod'sSake]

...and concluded that they represented impact cratering from a bolide that broke up in the atmosphere.

The problem as I understand with that conclusion is there have been no other indicators found from an impactor.........NONE. At least that I've run across in my searches. But who knows. Renfield is doing his best to explain all this in natural, make that, terrestial terms; I'm sure he gets frustrated. He has his own hypothesis that just sounds weird to me; being a layman ;^)