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Building on our previous work, we intend to test the hypothesis that the Larsen B Ice Shelf system has been a stable component of the cryosphere since it formed during rising sea levels 10,000 years ago. This conclusion would be an important step in establishing the uniqueness and consequences of the rapid warming taking place across the Peninsula. Our previous work on the Larsen A and B embayments taught us to recognize the signature and impact of past ice-shelf fluctuations. We have also overcome many of the limitations of radiocarbon-based chronologies in antarctic marine sequences by using geomagnetic-paleomagnetic intensity records for millennial-scale correlation and dating and by refining other dating techniques. http://www.nsf.gov/od/opp/antarct/treaty/opp06001/geo_geo.jsp#larsen