Editing Mount Baker (section)

====Mazama Park eruptive period: 6,600 years ago====
Source:<ref name=":0" />

Around 6,600 years ago, a series of discrete events culminated in the largest tephra-producing eruption in postglacial time at Mount Baker. This is the last episode of undoubted magmatic activity preserved in the geologic record.<ref name="Hildreth03"/> First, the largest collapse in the history of the volcano occurred from the Roman Wall and transformed into a lahar that was over {{convert|300|ft|m}} deep in the upper reaches of the Middle Fork of the Nooksack River. It was at least {{convert|25|ft|m|abbr=on}} deep {{convert|30|mi|km|abbr=on}} downstream from the volcano.<ref name="Scott03"/> At that time, the Nooksack River is believed to have drained north into the [[Fraser River]]; this lahar is unlikely to have reached [[Bellingham Bay]]. Next, a small hydrovolcanic eruption occurred at Sherman Crater, triggering a second collapse of the flank just east of the Roman Wall. That collapse also became a lahar that mainly followed the course of the first lahar for at least {{convert|20|mi|km|abbr=on}}, and also spilled into tributaries of the Baker River. Finally, an eruption cloud deposited ash as far as {{convert|40|mi|km|abbr=on}} downwind to the northeast and east.<ref name="Tucker07">{{cite journal |last1=Tucker |first1=D.S. |author-link1=Dave Tucker (geologist) |last2=Scott |first2=K.M. |author-link2=Kevin M. Scott |last3=Foit |first3=F.F. |last4=Mierendorf |first4=R.R. |date=2007 |title=Age, distribution and composition of Holocene tephras from Mount Baker, Cascade arc, Washington, USA |journal=Geological Society of America Abstracts with Programs |volume=39 |issue=4 |page=66 |url=http://www.mbvrc.wwu.edu/abstracts/abstractText.php?id=43 |access-date=2009-03-31 |archive-date=2022-12-05 |archive-url=https://web.archive.org/web/20221205014707/http://www.mbvrc.wwu.edu/abstracts/abstractText.php?id=43 |url-status=dead }}</ref>