A key stage in planet formation is the evolution of a gaseous and magnetized solar nebula. However, the lifetime of the nebular magnetic field and nebula are poorly constrained. We present paleomagnetic analyses of volcanic angrites demonstrating that they formed in a near-zero magnetic field (<0.6 microtesla) at 4563.5 ± 0.1 million years ago, ~3.8 million… (More)
Magnetic fields are proposed to have played a critical role in some of the most enigmatic processes of planetary formation by mediating the rapid accretion of disk material onto the central star and the formation of the first solids. However, there have been no experimental constraints on the intensity of these fields. Here we show that dusty… (More)
INTRODUCTION The following, who are listed in alphabetic order, are responsible for the given sections: The Double Trouble site (October–November 2008) was the thirteenth continuously cored borehole drilled as part of the New Jersey Coastal Plain Drilling Project (NJCPDP) and the tenth site drilled as part of Leg 174AX (Fig.