I was crawling over a frozen ocean (lost my feet to a croc, I carried them around with me in a bag) when all of the sudden a large square of ice (approximately 20x20, sorry didn't get a pic of this) got uplifted into a wall (causing DF to become non-responsive for a few seconds.) I got a few more of these as I traveled and until finally one massive, screen-filling one tossed me up and encased me in ice:
(http://i681.photobucket.com/albums/vv172/Bumber2009/Dwarf%20Fortress/Glacier.png)
(http://i681.photobucket.com/albums/vv172/Bumber2009/Dwarf%20Fortress/Glacier2.png)
Is this a normal feature or a bug?
Made another adventurer and got back out there. More pics and a save:
Take a few steps to the west and...
(http://i681.photobucket.com/albums/vv172/Bumber2009/Dwarf%20Fortress/Icewall1.png)
(http://i681.photobucket.com/albums/vv172/Bumber2009/Dwarf%20Fortress/Icewall2.png)
(http://i681.photobucket.com/albums/vv172/Bumber2009/Dwarf%20Fortress/Icewall3.png)
(http://i681.photobucket.com/albums/vv172/Bumber2009/Dwarf%20Fortress/Icewall4.png)
BAM! Icewalls.
http://dl.dropbox.com/u/43903851/GlacierSave.zip
I guess they don't call them the "Oceans of Appearing" for nothing. I'd say it's definitely a glitch.