Chang, A.S., and Patterson, R.T. 2007. Corrigendum to “Climate shift at 4400 years BP: Evidence from high-resolution diatom stratigraphy, Effingham Inlet, British Columbia, Canada”[Palaeogeography, Palaeoclimatology, Palaeoecology 226 (2005) 72–92] Palaeogeography, Palaeoclimatology, Palaeoecology, v. 243, p. 471-473.
The revisions as of 27 March 2006 in Section 5.4 “Interannual diatom abundance and assemblages” are as follows:
Error in calculating absolute abundances in samples S8-58, S8-59, and S8-60: must multiply originally published abundances by a factor of 10. Therefore, calculated averages and maxima are corrected as follows:
Mean abundance of diatoms counted from all 67 samples: 5.1×108 valves/g.
Mean abundance of Chaetoceros resting spores (CRS), all samples: 1.4×108 valves/g
Mean diatom abundance in thicker varves (samples S8-42 to S8-67): 7.0×108 valves/g
Mean CRS abundance in thicker varves: 1.7×108 valves/g
Maximum Skeletonema costatum absolute abundance: 1.7×109 valves/g
Average brackish/benthic diatoms in thicker varves: 4.7×107 valves/g.
The presence of the unknown morphology in varve 8 (sample S8-60) only affected the semi-qualitative description of laminae in thin section. The discussion about the unknown morphology diluting the diatom signal from the quantitative slide can be disregarded.
All other descriptions, discussions and interpretations remain the same as previously published. Figs. 2 and 5 have been revised.