TillaMurphs Posted February 1, 2010 Posted February 1, 2010 (edited) We recovered one of the USGS gold-colored disks yesterday and would like to know more about them. The one we ran into was set in 1924 and it is still incredibly bright. There was no hint of corrosion. About a year-and-a-half ago m&h started a very good thread on this subject here: Metallurgy? However, at that time there did not seem to be a definitive answer on the metallurgy of these disks. We looked in GeorgeL's excellent paper (Bottles, Pots, Pans...) and did not find anything. We wanted to run this up the flagpole again to see if there are any more ideas? In our area, many of these were set in 1913 and 1924. Besides the pictures previously posted by TheBeanTeam and MegaScooter in m&h’s original thread, here are a few others from Oregon (photos are not ours). QE0391: QE0696: RD0298 RD0322 Edited February 1, 2010 by TillaMurphs Quote
+Black Dog Trackers Posted February 1, 2010 Posted February 1, 2010 I still think it's Aluminum Bronze. These disks are old but the Berntsen company might happen to know. By the way, I just noticed their cool benchmark disk catalog here. Be sure to click on their Design Groups dropdown menu! Quote
+Holtie22 Posted February 2, 2010 Posted February 2, 2010 I've been getting survey markers from Berntsen for nearly 20 years. Starting about 6 years ago, they have been using my disk in their advertising. Holt Survey Associates I wonder if I should be getting royalties - or just enjoy the free publicity! Quote
TillaMurphs Posted February 2, 2010 Author Posted February 2, 2010 I still think it's Aluminum Bronze. I occasionally use Aluminum Bronze at work. In some ways it does not look like the disks - but in other ways it does. The color I saw on the disk was definitely more yellowish than the darker color I have seen on known Aluminum Bronze parts. However, maybe different proportions could be the cause of that? In the first photo I posted it looks like someone might have buffed the disk. That photo does resemble freshly polished aluminum bronze that I have seen. Quote
+Black Dog Trackers Posted February 2, 2010 Posted February 2, 2010 I agree about the aluminum bronze. Most of it tarnishes in some way and looks like junk, well actually they look about like the Primore disk in your second to last picture. Most of the gold ones though have a surprising shine to them that just seems unreal. I doubt the people who set those would imagine how bright they look after a hundred years out in the weather. As you say though, alloys seem to have a million combinations, sometimes with surprising results, like Wood's metal and those new super-powerful magnets they're selling these days. Quote
TillaMurphs Posted February 2, 2010 Author Posted February 2, 2010 Looking at posted photos, the only commonality I see is the monumenting agency. All except one are USGS. PID--MONUM-AGENCY-STATE O0158 1928 USGS UT FS0434 1920 USGS AZ FR0677 1920 USGS AZ JW0886 1923 USGS WV HW3569 1956 USGS WV RB0493 1925 USGS OR QE0391 1913 USGS OR QE0696 1913 USGS OR RD0298 1913 USGS OR RD0322 1913 USGS OR RD0904 1924 USGS OR RD0910 1924 USGS OR QE0483 1913 USGS OR RD1710 1924 USGS OR QD1020 1926 B.P.R. OR _none_ 1923 USGS MO Quote
southpawaz Posted February 2, 2010 Posted February 2, 2010 The only one I recall having seen is DT0715 ESCUDILLA, a USGS disk monumented in 1932 or 1934: Quote
TillaMurphs Posted February 3, 2010 Author Posted February 3, 2010 The only one I recall having seen is DT0715 ESCUDILLA], a USGS disk monumented in 1932 or 1934: Interesting mark southpawaz. It is monumented by the USGS but stamped USC&GS. Maybe USGS set it but USC&GS claimed it later the same year, or?? Quote
southpawaz Posted February 3, 2010 Posted February 3, 2010 The only one I recall having seen is DT0715 ESCUDILLA], a USGS disk monumented in 1932 or 1934: Interesting mark southpawaz. It is monumented by the USGS but stamped USC&GS. Maybe USGS set it but USC&GS claimed it later the same year, or?? It looks to me like the USGS set it in 1932 (? hard to read the small date below), then the C&GS "adopted" it in 1934. The reference marks are C&GS disks stamped ESCUDILLA USGS 1934. Quote
TillaMurphs Posted February 3, 2010 Author Posted February 3, 2010 (edited) It looks to me like the USGS set it in 1932 (? hard to read the small date below), then the C&GS "adopted" it in 1934. The reference marks are C&GS disks stamped ESCUDILLA USGS 1934. OK, that makes sense. I assumed that small stamping was 1934 also. Now that I look at it carefully it does look like 1932. Edited February 3, 2010 by TillaMurphs Quote
2oldfarts (the rockhounders) Posted February 3, 2010 Posted February 3, 2010 Here is the first one we found that made a big impression on me. It looked as though it had been polished to this beautiful, bright golden color. Here is the boulder it is set in. HO0158 in Zion National Park. Shirley~ Quote
+Black Dog Trackers Posted February 3, 2010 Posted February 3, 2010 Interesting that all but the West Virginia one are from the 1920's or earlier. The WV one gets a ton of rough treatment since it is in part of a gravel walkway to a popular observation tower, but it still can shine. Perhaps the WV one was in a drawer or box for 30 years before it was used. Quote
foxtrot_xray Posted February 3, 2010 Posted February 3, 2010 I like the one 2OF found, "Cooperation with the State". I haven't seen one of those in the wild yet. Me. Quote
Difficult Run Posted February 3, 2010 Posted February 3, 2010 Not as pretty as others posted, but here's one I found while looking for HW0240: T.T. STA. NO. 16-K 1927 (Transit Traverse Station Number 16-K) I'd say this can be traced back to a single manufacturer supplying disks to the USGS. (Gotta wonder what chemistry they used). Side note: Why the CGS set their own mark 60 feet away, about 6 feet lower and just 15 years later eludes me. ~ Mitch ~ Quote
TillaMurphs Posted February 4, 2010 Author Posted February 4, 2010 Ooo – more gold – thanks for the new photos. Here is an updated list of the gold disks. With one exception the dates were between 1913 and 1934 and with one exception they were USGS. Many were traverse disks. Given the spread across the country and across the years they obviously weren’t an anomaly. Someone must know their origin/material. Are there any USGS experts that visit our forum? Is there a USGS database? ID MON AGENCY STATE QE0391 1913 USGS OR QE0483 1913 USGS OR QE0696 1913 USGS OR RD0298 1913 USGS OR RD0322 1913 USGS OR FR0677 1920 USGS AZ FS0434 1920 USGS AZ GA1136 1920 USGS VA 1923 B 1923 USGS MO JW0886 1923 USGS WV RD0904 1924 USGS OR RD0910 1924 USGS OR RD1710 1924 USGS OR RB0493 1925 USGS OR QD1020 1926 BPR OR 16 - k 1927 USGS VA HO0158 1928 USGS UT DT0715 1934 USGS AZ HW3569 1956 USGS WV Here is the one we found last weekend (previously found by MegaScooter). Amazing shape for 86 years old. It is not even in a protected area. RD0910 Quote
holograph Posted February 4, 2010 Posted February 4, 2010 Maybe Aich's metal? Here is a description from an 1888 metallurgy book: The Metallic Alloys: A Practical Guide for the Manufacture of all Kinds of Alloys, Amalgams, and Solders, Used by Metal-Workers; Together with their Chemical and Physical Properties and their Application in the Arts and the Industries; with an Appendix on the Coloring of Alloys. (They really knew how to write book titles in the old days!) Aich's metal. -- This alloy, named after its inventor, consists of a brass to which a considerable degree of tenacity has been imparted by an addition of iron. It is especially adapted for purposes where the use of a hard, and at the same time, tenacious metal is required. According to analyses of various kinds of this metal, it shows, like other alloys, considerable variations in the quantity of the metals used in its preparation. Even the content of iron to which the hardening effect must be ascribed may vary within wide limits without the tenacity, which is the principal property of this alloy, being modified to a considerable extent . The best alloy, which can be called an Aich's metal, is composed of copper 60 parts, zinc 38.2, iron 1.8. The content of iron must be limited to from 0.4 to 3.0 per cent. Another Aich's metal showing excellent properties is composed of copper 60.2 parts, zinc 38.2, iron 1.6. The chief property of Aich's metal is its hardness, which is claimed to be not inferior to that of certain kinds of steel. It has a beautiful golden yellow color and is said to oxidize with difficulty, which makes it of great value for articles exposed to the action of air and water. Quote
+TheBeanTeam Posted February 5, 2010 Posted February 5, 2010 (edited) Great article on Aich's metal Hologragh. Here are my finds that I remember QE0492 in Dallas Oregon RB0493 in Pendleton Oregon RD0847 Another that Mega Scooter found before someone. Seems to be a theme here. This one in McMinnville Oregon. edit to fix links and add another photo Edited February 5, 2010 by TheBeanTeam Quote
Difficult Run Posted February 6, 2010 Posted February 6, 2010 Seems to be a theme here. Indeed... Here's two more to add.HW0098 Found by Artman and BDT. HW0612 Found by Cooke17513 and Garman I've seen some more logged around Skyline Drive, which I'll add later. And some very nice detective work there Holograph! ~ Mitch ~ Quote
TillaMurphs Posted February 6, 2010 Author Posted February 6, 2010 Good digging Holograph. Interesting metal; and it sure sounds like a good possibility. It seems to have been popular towards the turn of the last century and that also fits. There does not seem to be a lot of newer information on it. OK, now we need someone with a mass spectrometer. Anybody? We better look for photos of Mega Scooter to see if he is a leprechaun. Look at the amount of gold he has found: ID MON AGENCY STATE FINDER COUNTY QE0391 1913 USGS OR riverwood Marion QE0483 1913 USGS OR Mega Scooter Polk QE0492 1913 USGS OR TheBeanTeam Polk QE0696 1913 USGS OR PDXJim Polk RD0298 1913 USGS OR Rose Red Marion RD0322 1913 USGS OR AkNoT Washington FR0677 1920 USGS AZ 2oldfarts Mohave FS0434 1920 USGS AZ 2oldfarts Mohave GA1136 1920 USGS VA Harry Dolphin Wise 1923 B 1923 USGS MO GEO*Trailblazer1 Barry JW0886 1923 USGS WV 89SC Monongalia RD0847 1924 USGS OR Mega Scooter Yamhill RD0904 1924 USGS OR Mega Scooter Yamhill RD0910 1924 USGS OR Mega Scooter Yamhill RD1710 1924 USGS OR Mega Scooter Polk RB0493 1925 USGS OR TheBeanTeam Umatilla QD1020 1926 BPR OR m&h Deschutes 16 - k 1927 USGS VA Difficult Run Page HW0098 1927 USGS VA BlackDogTracker Rappahannock HO0158 1928 USGS UT 2oldfarts Washington HW0612 1928 USGS VA Garman Greene DT0715 1934 USGS AZ southpawaz Apache HW3569 1956 USGS WV BlackDogTrackers Pendleton If any of you run across more gold finds, post ‘em here and I will update the list. So far, Oregon is well in the lead with Virginia in second place and Arizona third. Thanks for the photos. Quote
2oldfarts (the rockhounders) Posted February 6, 2010 Posted February 6, 2010 I went through our finds and here is a list of additional marks that very in color from very bright to tarnished. Being lazy by nature I just post the address for the benchmark pages. John http://www.geocaching.com/mark/details.aspx?PID=HO0215 H 3 http://www.geocaching.com/mark/details.aspx?PID=HO0214 H 2 http://www.geocaching.com/mark/details.aspx?PID=HO0213 H 1 http://www.geocaching.com/mark/details.aspx?PID=HO0210 H 28 http://www.geocaching.com/mark/details.aspx?PID=HO0208 H 30 http://www.geocaching.com/mark/details.aspx?PID=HO0197 H 39 http://www.geocaching.com/mark/details.aspx?PID=HO0154 H 1 http://www.geocaching.com/mark/details.aspx?PID=HO0151 H 4 http://www.geocaching.com/mark/details.aspx?PID=HO0148 H 6 just a trace of the golden color at the top http://www.geocaching.com/mark/details.aspx?PID=ES0969 PROMONTORY more green than golden http://www.geocaching.com/mark/details.aspx?PID=GP0260 3 M golden just around the edge http://www.geocaching.com/mark/details.aspx?PID=GP0229 1 M http://www.geocaching.com/mark/details.aspx?PID=GQ0335 Hacks - Note the RMs http://www.geocaching.com/mark/details.aspx?PID=GQ0288 SHINARUMP CAIRN - Note the RMs http://www.geocaching.com/mark/details.aspx?PID=FR0529 3130 http://www.geocaching.com/mark/details.aspx?PID=FR0670 2968 Quote
AZcachemeister Posted February 6, 2010 Posted February 6, 2010 Do reference disks count? Just look at that FANCY arrow, too! APACHE MAID, ES1133 Quote
foxtrot_xray Posted February 6, 2010 Posted February 6, 2010 Do reference disks count? Just look at that FANCY arrow, too! APACHE MAID, ES1133 NEAT design! I love the detail in that! Quote
Okie'sKid Posted February 6, 2010 Posted February 6, 2010 Add these three in Montana to the list. None of these are my finds. KayakBird asked me to pass them on since he's out on the road right now. http://www.geocaching.com/mark/details.aspx?PID=RV0045 Looks like it was set yesterday. http://www.geocaching.com/mark/details.aspx?PID=rv0090 There may be some tarnish/dimming reaction to cow manure! http://www.geocaching.com/mark/details.aspx?PID=RV0105 Boy Scout camp damage? Also found by CallawayMT. Quote
TillaMurphs Posted February 8, 2010 Author Posted February 8, 2010 OK – I guess we know who the real leprechauns are: ID MON AGENCY STATE FINDER QE0391 1913 USGS OR riverwood QE0483 1913 USGS OR Mega Scooter QE0492 1913 USGS OR TheBeanTeam QE0696 1913 USGS OR PDXJim RD0298 1913 USGS OR Rose Red RD0322 1913 USGS OR AkNoT RV0045 1916 USGS MT kayakbird RV0090 1916 USGS MT kayakbird RV0105 1916 USGS MT CallawayMT FR0529 1920 USGS AZ 2oldfarts FR0670 1920 USGS AZ 2oldfarts FR0677 1920 USGS AZ 2oldfarts FS0434 1920 USGS AZ 2oldfarts GA1136 1920 USGS VA Harry Dolphin 1923 B 1923 USGS MO GEO*Trailblazer 1 JW0886 1923 USGS WV 89SC RD0847 1924 USGS OR Mega Scooter RD0904 1924 USGS OR Mega Scooter RD0910 1924 USGS OR Mega Scooter RD1710 1924 USGS OR Mega Scooter RB0493 1925 USGS OR TheBeanTeam QD1020 1926 BPR OR m&h 16 - k 1927 USGS VA Difficult Run HW0098 1927 USGS VA BlackDogTrackers HO0158 1928 USGS UT 2oldfarts HO0197 1928 USGS UT 2oldfarts HO0208 1928 USGS UT 2oldfarts HO0210 1928 USGS UT 2oldfarts HO0213 1928 USGS UT 2oldfarts HO0214 1928 USGS UT 2oldfarts HO0215 1928 USGS UT 2oldfarts HW0612 1928 USGS VA Garman CS3958 1930 USGS AZ AZcachemeister HO0151 1931 USGS UT 2oldfarts HO0154 1931 USGS UT 2oldfarts GP0229 1933 USGS AZ 2oldfarts GQ0335 1933 USGS AZ 2oldfarts GQ0288 1933? USGS AZ 2oldfarts DT0715 1934 USGS AZ southpawaz HW3569 1956 USGS WV BlackDogTrackers There may be some tarnish/dimming reaction to cow manure! Okie'sKid - Great Idea! Cow Poop Chemical Analysis! This should help narrow down the metallurgical composition. Thanks Quote
foxtrot_xray Posted February 9, 2010 Posted February 9, 2010 Okie'sKid - Great Idea! Cow Poop Chemical Analysis! This should help narrow down the metallurgical composition. Quote
+TheBeanTeam Posted February 9, 2010 Posted February 9, 2010 Okie'sKid - Great Idea! Cow Poop Chemical Analysis! This should help narrow down the metallurgical composition. Great now I have to add another item to my benchmarking kit. Anyhow, I did find another in Cottage Grove OR. 640=B 11 I have several others that are not from the same era that are gold in appearance but this one was pressure washed for sure based on earlier photos from previous finders. I suspect another gold one in my gallery was cleaned during bridge restoration but this one in Bend also looks bright and has for years based on the photos from 2002 until now. It is the same style as the other. As an interesting side note all of the Lane County Public Works disks that I have found do not appear to patina over the years. I have found many and not one appears to have discolored. Oh and here is another bright gold one in McMinnville.....but it isn't what were looking for I don't think. Quote
+TheBeanTeam Posted February 11, 2010 Posted February 11, 2010 (edited) Here are a few found by Volcanoguy. NY0629 Waymarking NY0629 Geocaching NZ0860 Waymarking NZ0860 Geocaching PB0231 Waymarking PB0231 Geocaching PB0225 - USCGS V 62 Waymarking PB0225 - USCGS V 62 Geocaching PB0218 - USGS M315 Waymarking PB0218 - USGS M315 Geocaching A different agency but made of the same stuff it looks like. None of these are listed in the Geocaching database. USDA FS 4256 USFS L 1929 USFS J USFS F1 USFS F4 USFS 5 USGS F8 USGS F10 USDA FS C-1 USFS A1 G USFS 6 USFS 7 USFS 8 USFS 6A USFS SS 2 And this is just the start. He has many more featured but I am out of time. Edit to fix links Edited February 11, 2010 by TheBeanTeam Quote
ArtMan Posted February 11, 2010 Posted February 11, 2010 Here's a nice one from Wilson, NC. EY0879 was confusing in some respects, and others (notably PFF) believe the disk corresponds to EY0880, the reset. I'm still not entirely convinced. Quote
Okie'sKid Posted February 11, 2010 Posted February 11, 2010 Here's a nice one from Wilson, NC. EY0879 was confusing in some respects, and others (notably PFF) believe the disk corresponds to EY0880, the reset. I'm still not entirely convinced. I'm going to venture out on a limb here and say, after reading both DSs and looking at the pix, this BM is EY0879. Maybe EY0880 should be added to the "NGS Typos" thread. Or, maybe 0880 is just plain bogus. Quote
+Mega Scooter Posted February 15, 2010 Posted February 15, 2010 AZchachemeister, Your old gold Reference Mark is outstanding. Please excuse me while I blush with envy. ArtMan, The Data Sheet says that the Stamping for EY0879 is “REESTABLISHED 1923”. The Data Sheet for EY0880 says the Stamping is “145 RALEIGH” (It says it in two places). Wouldn’t the RESET stamping say “145 RALEIGH RESET”? I’m thinking EY0879 was originally stamped “145 RALEIGH” and the reset (EY0880) was stamped “REESTABLISHED 1932”. Of course for that to be true, both Data Sheets would have to be in error. I guess that puts me in PPF’s camp. Clearly something is in error. It would be nice to see the original 1923 Data Sheet. —MS Quote
+Harry Dolphin Posted February 15, 2010 Posted February 15, 2010 (edited) Okay. Now I have a headache! Yes. The Data Sheet says that the Stamping for EY0879 is “REESTABLISHED 1923”. Presumably in 1935 when NGS added the USGS mark to its data base. EY0880 was added to the data base in 1942. I'd guess that the 1942 people didn't realize that the 1935 people had already added it. Human error on the part of the 1942 not to mention 'reestablished 1923'? My non-professional opinion? EY8079 was monumented first, and had the correct designation. EY0880 is a duplicate listing. I vote for EY0879. Edited February 15, 2010 by Harry Dolphin Quote
kayakbird Posted June 17, 2010 Posted June 17, 2010 Here is another BPR USDA Goldie from 1928. My unstamped NONPID found on Kings Hill Tuesday matches the factory lettering. OX0228 Yes; I'm caught up with NGS recoveries, mudded out of the Missouri Breaks and bored in Lewistown, MT. MEL Quote
kayakbird Posted January 27, 2012 Posted January 27, 2012 Just back from a pleasant early morning hike up a sparse creosote hillside north of NM 9 about three miles east of Antelope. Maybe it was the low sun angle, but the slightly raised center of this Tri station USGS PLAYAS seemed unusual. Scrolling though the other attached photos above it looks like if it was cast with 'datum' below the triangle the center is raised. kayakbird Quote
square nail Posted January 27, 2012 Posted January 27, 2012 Mel, Nice recovery. You always come up with something unusual. Did you notice the scribing in the concrete around the base of the disk? I wonder what that is all about? Gary Quote
TillaMurphs Posted January 27, 2012 Author Posted January 27, 2012 Thanks for resurrecting this thread. It gives me a chance to mention that we did come to a conclusion on the composition of the gold disks. On 29-April-2010, Bill93 posted a thread with a link to a Jerry Penry post on another forum that confirmed that these are aluminum bronze as Black Dog Trackers correctly surmised. Here is a link to the Jerry Penry post: Aluminum Bronze disks kayakbird, Nice unique find. Was that disk truly gold (like the others above) or did it just weather to a yellow-gold patina? The surface looks a lot rougher than the aluminum bronze disks in the photos above. Quote
kayakbird Posted January 27, 2012 Posted January 27, 2012 Mel, Nice recovery. You always come up with something unusual. Did you notice the scribing in the concrete around the base of the disk? I wonder what that is all about? Gary Gary, I did not see that!! It may be initials with a 1917, since it is one of the few USGS from that area that is dated. Almost worth a drive back from Rodeo after dark, but already worked every thing along that highway - Border Patrol has made it easy to stay out of traffic with their track roads right on the ROW fence. TillaMurphs '---yellow-gold patina?' I thought it was the standard 'Golden Oldie' but maybe some windblown mineral laden dust reaction with morning dew. Mike Quote
+UMainah Posted April 6, 2014 Posted April 6, 2014 I came across this one last summer. EAGLE MT Quote
+secondgunman Posted April 7, 2014 Posted April 7, 2014 I see the post from TillaMurphs in January of 2012 confirming that these are aluminum bronze. Too bad, though, I was going to offer to run it through the mass spec if someone could get their hands on a small sample. Having a chemistry degree comes in handy from time to time.... Quote
+Revent Posted April 21, 2014 Posted April 21, 2014 I'm surprised nobody has linked this yet, but this is (apparently) the definitive reference on USC&GS and NGS station construction... http://www.ngs.noaa.gov/web/about_ngs/history/Survey_Mark_Art.pdf Quote
kayakbird Posted February 3, 2015 Posted February 3, 2015 Mel, Nice recovery. You always come up with something unusual. Did you notice the scribing in the concrete around the base of the disk? I wonder what that is all about? Gary Gary & all, A revisit to this one has been way down in the bucket, not even in the warming oven (much less the back burner) until the current thread encouraged me to extend my winter birding trip in to New Mexico. Hidalgo County Playas Quote
TillaMurphs Posted February 9, 2015 Author Posted February 9, 2015 (edited) Mel, Nice recovery. You always come up with something unusual. Did you notice the scribing in the concrete around the base of the disk? I wonder what that is all about? Gary Gary & all, A revisit to this one has been way down in the bucket, not even in the warming oven (much less the back burner) until the current thread encouraged me to extend my winter birding trip in to New Mexico. Hidalgo County Playas kayakbird, You have a great memory! Congrats on following up. USHMT. Hmmmmmm? Edited February 9, 2015 by TillaMurphs Quote
+BasicPoke Posted February 10, 2015 Posted February 10, 2015 Some of those disks posted in this thread look really amazing, I am jealous. May have found something like this in OK but would have to go back and look at the photos. Thanks for sharing all these. Ron Quote
+Harry Dolphin Posted January 17, 2016 Posted January 17, 2016 Back in the neighborhood today. Remembered finding this benchmark eight years ago. Double checked to see in anyone else had found it. And I realized that it is gold colored. The one reference disk I found is not gold colored. LY0635 Quote
kayakbird Posted January 17, 2016 Posted January 17, 2016 Harry & All, I noticed that yours is a CGS disk - I believe that all the rest in this thread are USGS and from a much earlier era (OTM). kayakbird Quote
+Michaelcycle Posted March 13, 2017 Posted March 13, 2017 I think this is the oldest one in this thread so far: TU0100 Still holding up well despite the vog near the caldera Here is the profile: Note that the "state" (in cooperation with) was not a state at that time and would not become so until 1959! It is in the top of an interesting monument: There is no documentation about the monument although the NPS speculates that it is related to the completion of a road from Pahala to the Volcano House Hotel Quote
+Michaelcycle Posted March 15, 2017 Posted March 15, 2017 Turns out I beat my last "earliest" of this disk type while on the same trip: TU0030 is dated 1910. It was just a little too shaky out there for me to try and clean off this battered disk (I like my camera and didn't want it to wind up in the Pacific) Actually, it is surprising to me that the thing is there at all having survived multiple tsunamis including the catastrophic 146 and 1960 tidal waves. Here is a photo that shows the date and the elevation (5.83) that I took from another log and processed: photo credit: psubrian Quote
Amygdaloid Posted March 29, 2017 Posted March 29, 2017 The U.S. Lake Survey also used a metal that could maintain a beautiful gold color. I found this Azimuth reference mark that hadn't been visited since it was set in 1935. It looks absolutely pristine and the gold color was amazingly bright in the spring sunlight. Quote
TillaMurphs Posted January 13, 2018 Author Posted January 13, 2018 (edited) Found another this week. HB0752. USGS + State as with most of the others above. https://www.geocaching.com/mark/details.aspx?PID=hb0752 https://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=HB0752 Edited January 13, 2018 by TillaMurphs Quote
kayakbird Posted January 13, 2018 Posted January 13, 2018 "HB0752'PUBLIC SCHOOL, AT THE SOUTH SIDE OF THE SCHOOL GROUNDS, 6.5 FEET EAST HB0752'OF THE EAST SIDE OF A WALK LEADING TO THE MAIN ENTRANCE, ..." Wondering if the trees bordering the sidewalk to the school were saplings when the mark was set? kayakbird https://s3.amazonaws.com/gs-geo-images/bb4cee84-2b99-475e-8762-c6a3db002229.jpg Quote
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