It sounds like bedding planes of variable "quality" of limestone material or inclusions. Would be fun to investigate! Thanks, Eric Hammarberg Vice President Thornton Tomasetti 51 Madison Avenue New York, NY 10010 T 917.661.7800 F 917.661.7801 D 917.661.8160 [log in to unmask] This message sent from Treo, please pardon spelling and other mistakes. -----Original Message----- From: [log in to unmask] [mailto:[log in to unmask]] Sent: Saturday, July 28, 2007 12:06 PM Eastern Standard Time To: [log in to unmask] Subject: [BP] eroded limestone question I was looking at the twin-towered Majestic this morning - the 1931 building erected by Irwin Chanin, across the street from the Dakota. Unlike the cast-stone lower floors of its very-near-relation the Century, at 62nd, the Majestic's are of limestone. It has an unusual appearance, and I am not certain I have seen it on any other building in New York. There are very fine, irregular erosion troughs, just lines really, all longitudinal, kind of like rain drops smearing across the porthole of your 300 mph jet liner. They are not like beach stuff or wave action, like I see in other stone installations. The lines are all parallel to the sidewalk, so they were installed with a knowledge of the actual graining. Have I described this adequately? Kind of like someone took a very irregular comb across the surface, although they are clearl eroded, not mechanically made. But I cannot imagine what the character or method of the original deposit was to subsequently allow this lines. This pattern appears on 9 out of 10 of the perhaps 300 blocks (typicall 4" deep, and perhaps 4 feet on a side). What are they? Christopher _____ Get a sneak peek of the all-new AOL.com. -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: http://listserv.icors.org/archives/bullamanka-pinheads.html <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> The information in this email and any attachments may contain confidential information that is intended solely for the attention and use of the named addressee(s). This message or any part thereof must not be disclosed, copied, distributed or retained by any person without authorization from the addressee. If you are not the intended addressee, please notify the sender immediately, and delete this message. <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><> -- To terminate puerile preservation prattling among pals and the uncoffee-ed, or to change your settings, go to: <http://listserv.icors.org/archives/bullamanka-pinheads.html>