Figure 6. Rose diagrams of ice-flow indicators west and east of the Penobscot River. Ice flow during the flow maximum was approximately north-south (175° azimuth vector mean, lavender petals). West of the river, a continuous suite of striations and crag-and-tail features show how ice flow became more easterly (green petals) as deglaciation proceeded. East of the river, discrete southerly (lavender petals) and younger westerly sets (280° azimuth vector mean, green petals) are present, and intermediate values are not observed. Secondary ice flow (marked by green petals) clearly converged along the axis of the Penobscot River lowland. Unique flow indicators include crag-and-tail features only. Both possible flow directions are plotted for non-unique flow indicators (striations and grooves), hence the perfect petal symmetry. Numbers along cardinal axes are percentages of total data.

Higher resolution PDF image of Figure 6 (375 Kb).

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Last updated on January 13, 2009

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