Saturday, January 31, 2015

Clarifying that Comment

(or at least trying to)
(Illustration/map from "1493" by Charles C. Mann)
      Jumping off of the Rock Piles Post "Agricultural use versus rock pile site" to here:


Tim MacSweeney said...

The map comes from pages 40 of "1493," the follow up to "1491." The credit reads:
"Maps created by Nick Springer and Tracy Pollack, Springer Cartographics LLC: copyright by Charles C. Mann"

Curt Hoffman said...

It would be interesting to know what their sources were. I suspect that in southern New England, at least, the clearing of land was more extensive inland than is shown. And I have some serious doubts about the degree of land clearance along the coast in the Maritimes!

Meanwhile, here's another clue for you all: based on GIS data, 25.1% of the 4489 sites for which I have this information (currently lacking for Delaware, Maryland, and the Maritimes) are within 1 km of a fault line. Distance to fault line falls off beyond this, as follows:

1 - 2 km: 17.2%
2 - 3 km: 10.8%
3 - 4 km: 7.4%
4 - 5 km: 6.0%

Only 16.8% are more than 10 km from a fault line.

pwax said...

That is an interesting correlation