The Podere Funghi is an Etruscan ceramic production site adjacent to Poggio Colla, a hilltop ritual center in the Mugello Valley (Vicchio, FI). Prior to our study a workshop and set of kilns had been excavated at the Podere Funghi, and an adjacent dump and surface scatters suggested additional occupation and ceramic producing activities elsewhere in the field (Warden 2007; Fedeli and Warden 2006; Warden et al. 2005; Warden and Thomas 2003; Gleba 2003). The present study, conducted in 2007 and 2008, combined subsurface archaeological testing with geophysics in an attempt to investigate other evidence of past activity on the site. At the same time, our work in adjacent fields explored the extent of ceramic-related industries of this and other time periods.

Archaeomagnetic data can supplement direct observations of the geomagnetic field in the development of high-resolution records of regional secular variation. Archaeomagnetic data from historic archaeological features are particularly well suited for this because of the highly accurate and precise dating afforded through historic documents and artifacts. Here, archaeomagnetic directional data from 20 well-dated historic archaeological features in the eastern US. are presented and compared to existing models of secular variation and historic field measurements to demonstrate the compatibility between archaeomagnetic and direct measurements of geomagnetic field directions. Then, a previously undated historic brick kiln from Virginia is archaeomagnetically dated to the late 17th-early 18th centuries by statistically comparing the kiln's archaeomagnetic data to existing secular variation models.

North American archaeomagnetic data have been compiled using a relational database management system. There are currently 1875 archaeomagnetic directions and 151 paleointensity results in the database.

Knowledge of the long-term secular variations of the global geomagnetic field strength and atmospheric radiocarbon activity have proceeded in tandem over the past 40 years. The simultaneous pursuit of these fields of research was an important factor in the recognition of long-term radiocarbon fluctuations because a plausible physical mechanism was provided. This chapter will review both the paleomagnetic and radioisotope research that bears on the problem of geomagnetic modulation of radiocarbon fluctuations.

Oriented archaeomagnetic samples were collected from 158 in situ features at 33 archaeological sites in the southwestern United States. Seventy‐three independently dated features were used for analysis of secular variation. A moving‐window technique with outlier rejection was developed to compute a smoothed secular variation curve. This technique incorporates weighted Fisher statistics to account for imprecision in both the age of remanence acquisition and the direction of magnetization for each feature. A mean direction and measure of dispersion is generated for each window of time. The secular variation record covers the period A.D. 750–1425, during which time the virtual geomagnetic pole (VGP) moves in a generally counterclockwise fashion from 86°N, 83°E at A.D. 750 to the lowest latitude position of 74°N, 192°E at A.D. 1075, and then to 85°N, 236°E at A.D. 1425. The median rate of VGP movement is 0.036° yr−1, similar to present‐day rates. The Southwestern record shows close correspondence to other North American archaeomagnetic, limnomagnetic, and speleomagnetic records. The archaeomagnetic record can serve as the master curve for the derivation of archaeomagnetic dates.