EVAPORATED DATASHEET

[kayakbird]

New mystery - a fitting finish to a three week out of state road trip.

 

In 1993 the Surveying Societies of Montana, South Dakota and Wyoming along with the BLM did a bit of enhancement/renewal/protection of their common corners 25 miles northwest of Belle Fourche, SD. At that time three reference objects were set at the BOUNDARY MON SE CORNER MT PV0443 but a recovery was not completed to bring its history up to date.

 

The question bothering me is at BOUNDARY MON NE CORNER WY

 

 

Looks like a 1993 disk was added for some reason to the top of the three state post and got a PID dated 1993. NE CORNER WYOMING

 

 

Since that time the original 'post only' PID PV0445(linked at top photo) has been removed from the DATASHEET and cannot be retrieved.

 

IN GEOCACHE (Retrieved using the 'nearest' function.)

PV0445 DESIGNATION - BOUNDARY MON NE CORNER WY

PV0445_MARKER: V = STONE MONUMENT

PV0445_SETTING: 0 = UNSPECIFIED SETTING

PV0445_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY

PV0445

PV0445 HISTORY - Date Condition Recov. By

PV0445 HISTORY - 1912 MONUMENTED CGS

PV0445

PV0445 STATION DESCRIPTION

PV0445

PV0445''DESCRIBED BY COAST AND GEODETIC SURVEY 1912 (EHP)

PV0445''A RED GRANITE POST 12 INCHES SQUARE, PROJECTING 3 FEET ABOVE

PV0445''GROUND, 269.41 METERS (883.9 FEET) S 35 DEG 18 MIN W

PV0445''FROM STATION NORTHEAST CORNER WYOMING, BOUNDARY MONUMENT

PV0445''ECCENTRIC. ABOUT 3 FEET WEST IS BLOCK OF SOFT

PV0445''WHITE SANDSTONE 18 BY 22 INCHES ON TOP AND PROJECTING ABOUT

PV0445''2 FEET ABOVE GROUND. THIRTY-SEVEN PACES EAST IS 2-INCH IRON

PV0445''PIPE WITH BRONZE CAP PROJECTING 1 FOOT ABOVE SURFACE OF GROUND

PV0445''AND MARKED U.S. GENERAL LAND OFFICE SURVEY, 1910. 250 DOLLAR FINE

PV0445''FOR REMOVAL. MONT-WYO-S.D., T. 9, R., 62-63, SEC. 36--SEC. 31.

 

Is the current DS an attempt to simplify the system or a series of clerical errors?

 

ORIGINAL DATASHEET IN GEOCACHE:

AA2139_MARKER: DD = SURVEY DISK

AA2139_SETTING: 0 = UNSPECIFIED SETTING

AA2139_STAMPING: WYOMING MONTANA SOUTH DAKOTA 1993

 

AA2139

AA2139 HISTORY - Date Condition Recov. By

AA2139 HISTORY - 1993 MONUMENTED BLM

AA2139

AA2139 STATION DESCRIPTION

AA2139

AA2139''DESCRIBED BY BUREAU OF LAND MANAGEMENT 1993 (MDL)

 

AA2139' . STATION MARK IS A DISK SET ATOP A 1 X

AA2139''1 X 6 FEET (1.8 M) GRANITE COLUMN SET 3 FEET (0.9 M) IN THE GROUND AND

 

AA2139''SURROUNDED BY A TRIANGULAR CONCRETE PAD AND FENCE. IT IS 2 M (6.6 FT)

AA2139''SOUTH OF AN EAST-WEST FENCE LINE.

 

CURRENT NGS DATASHEET:

AA2139_MARKER: DD = SURVEY DISK

AA2139_SETTING: 0 = UNSPECIFIED SETTING

AA2139_STAMPING: WYOMING MONTANA SOUTH DAKOTA 1993

AA2139_MARK LOGO: BLM

 

AA2139 HISTORY - Date Condition Report By

AA2139 HISTORY - 1912 MONUMENTED CGS

AA2139 HISTORY - 1993 GOOD BLM

AA2139

AA2139 STATION DESCRIPTION

AA2139

AA2139'DESCRIBED BY COAST AND GEODETIC SURVEY 1912 (EHP)

AA2139'A RED GRANITE POST 12 INCHES SQUARE, PROJECTING 3 FEET ABOVE

AA2139'GROUND, 269.41 METERS (883.9 FEET) S 35 DEG 18 MIN W

AA2139'FROM STATION NORTHEAST CORNER WYOMING, BOUNDARY MONUMENT

AA2139'ECCENTRIC. ABOUT 3 FEET WEST IS BLOCK OF SOFT

AA2139'WHITE SANDSTONE 18 BY 22 INCHES ON TOP AND PROJECTING ABOUT

AA2139'2 FEET ABOVE GROUND. THIRTY-SEVEN PACES EAST IS 2-INCH IRON

AA2139'PIPE WITH BRONZE CAP PROJECTING 1 FOOT ABOVE SURFACE OF GROUND

AA2139'AND MARKED U.S. GENERAL LAND OFFICE SURVEY, 1910. 250 DOLLAR FINE

AA2139'FOR REMOVAL. MONT-WYO-S.D., T. 9, R., 62-63, SEC. 36--SEC. 31.

AA2139

AA2139 STATION RECOVERY (1993)

AA2139

AA2139'RECOVERY NOTE BY BUREAU OF LAND MANAGEMENT 1993 (MDL)

 

AA2139' STATION MARK IS A DISK SET ATOP A 1 X

AA2139'1 X 6 FEET (1.8 M) GRANITE COLUMN SET 3 FEET (0.9 M) IN THE GROUND AND

AA2139'SURROUNDED BY A TRIANGULAR CONCRETE PAD AND FENCE. IT IS 2 M (6.6 FT)

AA2139'SOUTH OF AN EAST-WEST FENCE LINE.

 

Trip did provide material for several lengthy NGS recovery notes; and posts here for chisel marks, CGS+SS disks and beautiful lichens. kayakbird

[Bill93]

Some thoughts, not in any way authoritative:

 

After the rehabilitation of the stone and placement of the disk, it was observed to modern standards of a few cm, and got a new data sheet AA2139. The old mark was probably the crossing of the diagonals, or maybe marked with a chisel? The new disk would have wiped out any chisel mark. The new data sheet made the old data sheet PV0445 extraneous. It was less accurate at only 2nd order, and the distance between points didn't check anywhere near to second order accuracy. Compare the initial, now superseded NAD83(1993) latitude of AE2139 (which was probably copied from PV0445) with its other 1993 value, which was probably the GPS measurement in that datum flavor.

 

It would seem like they could have just upgraded PV0445, which I think I've seen done in other places, but I've also seen new data sheets. Since they didn't upgrade the old one, my next guess would have been to leave PV0445 marked "No Geodetic Data" or one of the other codes for marks of little use. Third idea and reality, they removed it entirely. I guess we don't know the thinking inside NGS.

 

It's curious that the fence doesn't run across the monument, since the monument has been there for so long, and you would expect the land ownership to change at the state line.

 

It took me a little while to realize that the South Dakota line jogs a mile east here and PV0443 is over there.