We spent the morning doing a multibeam bathymetry and chirp seismic survey of the coastline around St. Marc Bay, as posted just above. When I got up this morning we were close to shore and the uplifted marine terraces were incredibly prominent, as we knew they would be thanks to Google Earth and SRTM data. It's worth a look in Google Earth at St Marc Peninsula Haiti. Looks like many of the California Channel Islands (not including Catalina), and much of the California coast (north of Santa Cruz City, many places in southern California). Maybe Santa Rosa Island is the best comparison. The Google Earth-SRTM shows the originally paleo-horizontal inner edge of the platforms has been folded. These were formed during inter-glacial highstands of sea level. The 120,000 year terrace is dated (Mann and others 1995). I'm guessing taht the next higher very prominent one is 400,000 years, because it was very warm for a long time then, and forms a prominent terrace in California (may be infererred assuming constant uplift rate more than dated).

If 400,000 years, then two interglacials are missing in record. Well, looks like they are not missing because theer seem to be two subtle terraces, maybe fossil reefs, in between.

We need to come back and dredge and pipe core the submerged glacial terraces, and date them with Uranium-thorium, and HW can send down an AUV to do micro-bathymetry and take pictures.

The blog by Katie Mishkin will likely later have a picture. Marcy Davis did a color drawing that I will likely use on the poster.

Chris