Now that we have established that the northern California CaCO3 MAR time series are driven by changes in CaCO3 production, what can we say about the coherence of these production events along the California margin? Unfortunately, we do not yet have any good high-resolution records from the south to compare with the drill sites >37°N. Figure 18 shows the two time series we now have from the south, at Site 1011 and at a piston core (Core Y74-2-22P) near the tip of Baja California. Both records have low resolution but show hints of at least some coherent response along the California margin.
The strong CaCO3 event, CC 2-1 at 16.6 ka, is evident in all records and there is at least some CaCO3 fluctuations near the MIS 4/5 boundary. Whether these represent CaCO3 peaks like those seen in the north requires higher resolution time series than we have collected. Tentatively, we believe that echoes of the events in the north may be expressed in the southern California Current region, but the strength of the events appears to change along the margin.