The AMS of standard paleomagnetic cube samples was measured at the Institute for Rock Magnetism at the University of Minnesota. Samples taken to study depositional event characteristics, and some samples taken to study downcore trends at Site 1061, were analyzed on the "Roly-Poly." This is a susceptibility bridge designed and built in-house, with an automated sample handling and data acquisition system. Samples from both Sites 1061 and 1057 were analyzed on a Geofyzika KLY-2 Kappabridge.
The susceptibility (K) data are represented by a symmetrical ellipsoid with three orthogonal axes, where K1 
K2 K3. The lineation parameter (L) describes the elongation of the ellipsoid along its principal axis. The foliation (F) parameter describes the degree of flattening of the ellipsoid along its minor axis. These parameters can be calculated from the susceptibility components L = K1/K2 (Balsley and Buddington, 1960), F = K2/K3 (Stacey et al., 1960), and Kmean = (K1 + K2 + K3)/3 (Nagata, 1961). SI units are used throughout.
Declination values were corrected using data provided by the tensor tool (Keigwin, Rio, Acton, et al., 1998b). Declination values for Cores 172-1061A-9H and 172-1061C-11H, for which no tensor tool data were available, were provided by G.D. Acton (pers. comm., 1997) All declination values include a correction to compensate for an error in the magnetometer software (G.D. Acton, pers. comm., 1997). For K1, bipolar declinations are also presented normalized to a west (-90°) to north (0°) to east (+90°) 180° radius.
AMS data collected on the Roly-Poly were filtered for reliability by dividing the ratio of the root-mean-square (RMS) values of the residual and best-fit susceptibility expressed as a percentage (RMSr/k = RMS residual · 100/RMS best fit) by the percent anisotropy ([K1 - K3] · 100/Kmean), and rejecting any data sets with ratios <0.1. The ratio of the RMS values is an indicator of the degree of scatter of the individual susceptibility measurements from the calculated susceptibility ellipsoid, and this is compared to the magnitude of anisotropy being described by the data. Kappabridge data were filtered using variance F values calculated for the main and intermediate axes (F12), and the intermediate and minor axes (F23) by the software package. Acceptance of lineation data is based upon the F12 value. Acceptance of foliation data is based upon the F23 value, and other parameters are accepted based upon both F12 and F23 values. Data are accepted if they have a F value of 2 or greater. This is based upon observations that data sets with F values <2 generally have inclination or declination values for the K1 or K3 axes that suggest the sample may have been disturbed, or have other parameters (e.g., 95% confidence angles) suggesting that the data might be unreliable.
Sediment carbonate content was determined by coulometry at Wesleyan University (Tables T1, T2).
