Exploring the Northwoods Country, Part 7: Another Year, Another Tour Group | Ely, Minnesota, USA
Taken at the location cited in Part 3 of this set.
My previous photos of the Ely pillow-lava boulder were taken in 2003 and 2008, but I also led a tour here in 2004, as the image above indicates.
This shot shows the upper western side of the big rock, and the pillows at right are particularly well-defined. At least some of them seem to have a flatter side and a somewhat more domed side—theoretically, the latter should have been the original top of each blob of extruded lava. But from what I can see here, it's difficult to draw any firm conclusion about the original orientation from the ways the different domed sides point.
For more on the geologic origin of the Ely Greenstone pillows and the glacial-erratic boulder that contains them, see Part 3 of this set.
You'll find the other photos and descriptions of this series in my Exploring the Northwoods Country album.
Exploring the Northwoods Country, Part 7: Another Year, Another Tour Group | Ely, Minnesota, USA
Taken at the location cited in Part 3 of this set.
My previous photos of the Ely pillow-lava boulder were taken in 2003 and 2008, but I also led a tour here in 2004, as the image above indicates.
This shot shows the upper western side of the big rock, and the pillows at right are particularly well-defined. At least some of them seem to have a flatter side and a somewhat more domed side—theoretically, the latter should have been the original top of each blob of extruded lava. But from what I can see here, it's difficult to draw any firm conclusion about the original orientation from the ways the different domed sides point.
For more on the geologic origin of the Ely Greenstone pillows and the glacial-erratic boulder that contains them, see Part 3 of this set.
You'll find the other photos and descriptions of this series in my Exploring the Northwoods Country album.