What was done
The authors' goal was to determine Late Holocene fluctuations of two key westward-flowing outlet glaciers of the Myrdalsjokull ice cap, Iceland: Tungnakvislajokull and Krossarjokull.  This they did via "geomorphic mapping and geochronology based on a combination of historical sources, lichenometry and tephrochronology."

What was learned
Casely and Dugmore report "there is geomorphological and tephrochronological evidence for a "LIA" [Little Ice Age] maximum Holocene advance of Krossarjokull and Tungnakvislajokull, which probably culminated in two advance phases during the early and mid-19th century," noting "there is no evidence of Neoglacial advances of a greater extent."  In addition, they report that, "as elsewhere in the North Atlantic, the LIA advances at these southwest outlets of Myrdalsjokull are the most extensive during Neoglaciation."

What it means
After reaching what was likely the coldest part of the entire Holocene or current interglacial, i.e., the Little Ice Age, it is little wonder the planet would have to warm a fair amount to return to relative interglacial "normalcy," i.e., temperatures characteristic of the Medieval and Roman Warm Periods; yet climate alarmists continue to rant and rave over what was only to be expected: that temperatures would rise significantly after having fallen significantly.