[Geysers] Marler Inventory

[TSBryan at aol.com]

The coordinates used in Marler's Inventory for locating thermal features  
were devised by the USGS for their post-15 earthquake mapping in the 1960s and  
early 1970s. the system consists of a grid of squares that measure 1000 feet  
east-west and 1000 feet north-south. The northermost tier of these squares is  
row "A", and these are numbered from west to east -- A1, A2, A3, etc.
 
The next tier to the south is (logically, I trust) B, then C, etc.
 
Within any one of these squares -- say for example H8, a thermal feature is  
located by measuring eastward, then southward from the northwest corner of the 
 square. So, Daisy Geyser is located in grid square H8, 280 feet east and 55 
feet  south of the northwest corner of H8. 
 
I do not know -- does anybody ? -- just why the apparent origins were  chosen 
where they were, since for example the Upper Basin's A1 is way up on  the 
plateau northwest of Biscuit Basin. I'm sure the USGS had established survey  
points out there somewhere, but if any exist now, I don't know where they  are.
 
Anyhow, this was done for each of the geyser basins -- Upper, Midway,  Lower, 
Norris, West Thumb, and Shoshone (they didn't do Heart Lake or Gibbon) --  as 
well as Mud Volcano and Mammoth. These grids are shown on the Thermal Maps  
just discussed on this list in the last couple of days.
 
Scott Bryan
-----------
 
 
In a message dated 12/15/2008 7:29:17 P.M. US Mountain Standard Time,  
jack.ashe at yahoo.com writes:

Apologies if this has been discussed before. I am new to this list so  I  
searched the archives 2 years but could not find a  match for this issue.
I have been reading Marler's Inventory  (from early 70's) and he  uses a 
unique method for defining the location of thermal features that may  have been 
placed on an unpublished USGS map according to the  introduction in the GOSA 
materials  It seems that his inventory is  more complete than the Research 
Coordination Network.   Is there a  method to convert his system to something more 
traditional  (lat-long or  UTM)? This would presumably be a spread sheet or a 
formula for making the  conversion or at least a list of the reference points 
he used.
Jacques Ashe
Helena, Montana


**************Make your life easier with all your friends, email, and 
favorite sites in one place.  Try it now. 
(http://www.aol.com/?optin=new-dp&icid=aolcom40vanity&ncid=emlcntaolcom00000010)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: </geyser-list/attachments/20081215/429ddfac/attachment.html>