Mystery Hill (America's Stonehenge) New Hampshire

CARBON-14 DATES

A total of 15 C-14 dates have been obtained from charcoal recovered in various archaeological excavations at the America’s Stonehenge site. These dates are given as B.P. dates known as “years before present” which is currently defined as the year 1950. These dates are consider “radio carbon years” which is different calendar years. A few of the tests have “corrected dates.” These are indicated by (date)*.


	Click the links to view the original laboratory reports. Copies of the original reports courtesy of America’s Stonehenge Inc.

Date (B.P.)	Location	Report #	Citation
6530 +/- 40 (7389 BP)*	“Excavation in wall east of north stone ... down hill”	8923	Details from information posted at Visitor’s Center & Lab Report (1995)
3470 +/- 30 (3697 BP)*	Fire pit at North Stone. Excavation by Stewart-Smith, Hume & Hinton.	8924	Details from information posted at Visitor’s Center & Lab Report (1995)
3475 +/- 210 (3775 BP)*	Flecks of charcoal found lodged between the exterior stones of the north wall of the Collapse Chamber 2 to 4 inches above bedrock. It has been subsequently determined that charcoal was in backfill soil and does not date the chamber.	GX2310	Anon 1971, 40 Whittall 1991, 64
2995 +/- 180	Outside of the north wall of Collapsed Chamber (charcoal, fire-burnt stone spalls, hammer stone, broken pick, scraper) 24” level of excavation.	GX1608	Whittall 1969b, 50-53 Whittall 1991, 64
2120 +/- 95	Charcoal found on and in a seam of quarried bedrock (below ground near ditch drain & low walled enclosure)	GX2029	Whittall 1971, 19-20 Whittall 1991, 64
1910 +/- 190	Indian Lodge (parking lot) (C13 Corrected)	GX20669	Lab Report (1995)
1640 +/- 135	Indian Lodge (parking lot)	GX20670	Posted at Visitor’ s Center
1430 +/- 135	Oracle Chamber / Covered Drain Leading to Sump Pit	GX4732	Whittall 1977, 18-21 Whittall 1991, 64
1250 +/- 100	North Stone / Hearth	GX15349	Whittall 1991, 64
1195 +/- 75	Indian Lodge (parking lot) (C13 Corrected)	GX20671	Lab Report (1995)
less than 400	Covered Drain in Sunken Courtyard / Re-used for House Foundation 1825 - 1849. Archaeologist Frank Glynn argued that the sample came from soil contaminated by Pattee era sediments which intermixed with earlier sediments in the drain.	GX0025	Glynn 1967, 55 Whittall 1991, 64 Lab Report (1967)
260 +/- 90	Wood sample from root of a pine stump (Roots of pine stump went under wall of Collapsed Chamber proving the chamber was older than 260 years old)	GX1118	Glynn 1967, 57 Whittall 1991, 64
220 +/- 140	Fire Pit excavated by James Whittall Cover letter mentions brickmaking suggesting a location near the clay pit.	GX1651	Posted at Visitor’s Center
75 +/- 160	Excavation by W.E.J. Hinton Jr. (No Information)	GX15348	Lab Report (1989)
140	Covered Drain (1810 A.D.) Sunken Courtyard / Reused for House Foundation 1825 -1849. Archaeologist Frank Glynn argued that the sample came from soil contaminated by Pattee era sediments which intermixed with earlier sediments in the drain.	GX0024	Glynn 1967, 55


	* These are are calibrated or “corrected” dates and considered more accurate.