81 data points, coordinates in UTM NAD27 Clarke1866. Data from Britt Hill. 
In Hill et al. (1998)

UTM(E)		UTM(N)		thickness(cm)
522100.0		1378210.0		1.5
521140.0		1377890.0		1.2
522080.0		1377990.0		1.1
523990.0		1378210.0		1.4
525290.0		1378660.0		1.1
526520.0		1378620.0		1.4
527440.0		1378910.0		1.3
529140.0		1379180.0		1
531150.0		1380360.0		2
530910.0		1380850.0		4.5
532120.0		1381020.0		1
532510.0		1381780.0		0.5
531190.0		1380790.0		3.5
530230.0		1380860.0		3.5
529520.0		1380720.0		5
529540.0		1380800.0		5
527910.0		1380840.0		4.5
529010.0		1380970.0		6
528340.0		1380870.0		5
525120.0		1380980.0		3.4
525560.0		1381340.0		2.5
525580.0		1381620.0		2.5
525810.0		1381900.0		3
526000.0		1382540.0		2.5
527750.0		1383240.0		1.5
528690.0		1383270.0		1.5
527450.0		1383660.0		1.1
526590.0		1383580.0		0.5
525500.0		1383000.0		0.5
525280.0		1382320.0		1.8
524200.0		1382350.0		0.7
522830.0		1382930.0		0.6
522560.0		1381550.0		0.8
521820.0		1381750.0		0.6
522140.0		1381780.0		1
520970.0		1380420.0		0.6
519590.0		1380090.0		0.4
517750.0		1379160.0		0.3
516130.0		1378370.0		0.5
514620.0		1377820.0		0.5
516130.0		1380600.0		0.2
514410.0		1377410.0		0.5
514930.0		1375420.0		0.6
514740.0		1374280.0		0.3
514210.0		1373130.0		0.2
514270.0		1372510.0		0.1
511590.0		1372550.0		0.1
528890.0		1382680.0		2
528970.0		1383190.0		1.5
529650.0		1383210.0		2
530190.0		1382900.0		2.5
531100.0		1383260.0		3.8
531570.0		1383210.0		1.8
531990.0		1382680.0		4
531610.0		1383060.0		11
531840.0		1383010.0		28
531580.0		1382670.0		42
531480.0		1382590.0		48
531070.0		1382250.0		49
531400.0		1381860.0		25
531420.0		1381620.0		15.5
531430.0		1381590.0		11
531420.0		1381520.0		6
531110.0		1381560.0		19
531100.0		1381790.0		37
530950.0		1381850.0		40
530690.0		1381740.0		32
530270.0		1381690.0		31
530230.0		1381720.0		20
530040.0		1381670.0		15
529780.0		1381700.0		13.5
529850.0		1381840.0		15
530100.0		1382200.0		10
530230.0		1382220.0		13
530420.0		1382380.0		10
530700.0		1382290.0		18
530930.0		1382430.0		19
531110.0		1382650.0		17
531290.0		1382970.0		14
531300.0		1383070.0		5
516659.0		1384326.5		0.2