We prepared a core that has excellent internal sediment structures with lamination, i.e., the preserved products of rapid environmental changes in the past. This was maybe the only core that had very little bioturbation. Bioturbation occurs when organisms disturb the original sediment structures with their burrows. This process destroys the natural lamination within. The core was taken just in front of the Guadalquivir River mouth in 22 m of water.
A typical mud depocenter core is composed of very fine brown/grey pretty homogenous mud that has collected on a continental shelf over time. In the northern Gulf of Cadiz, the very gently sloping shelf allows for sediment accumulation to occur in areas where ocean bottom currents are minimal. Most of the cores we collected during the CADISED cruise on RV Poseidon in March 2015 were composed of this very fine mud, sometimes with centimeter sized layers of siltier mud. Often bivalves, gastropods and worm tubes could also be found within.
With the aim to decide the next steps of core analysis, today we compared the cores, discuss possible transgressive sequences, and where the base of the mud depocenter is located in the Guadalquivir area of the Gulf of Cadiz.
Saturday, I took the day to explore Hamburg, the second largest city in Germany. The people from there call their city “my pearl” and “the gate to the world”. Train traveling has been a great experience so far. Everything is almost exactly on time! The train ride to Hamburg from Bremen took only a little over and hour and a half. During my adventure, I met people biking Germany from Sydney, Australia. One of them was actually born in Pittsburgh, PA which is only an hour and a half’s drive from my hometown. SMALL WORLD!
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