Lake Bosumtwi, Ghana, fills the majority of a ~10 km diameter impact crater. Despite the lake’s small size and modest drainage basin, its sediments contain a proven archive of late-Quaternary climate variability. A ~1.1 Ma (300 m) drill core collected from the lake in 2004 represents one of only a few long continuous sediment records from continental western Africa. Unfortunately, large chronologic uncertainty has long limited use of this record. Though there have been several attempts to refine the chronology, there are few direct ages older than ~150 ka (75 m below lake floor). To reduce chronologic uncertainty, we produced 26 luminescence ages, collected at a ~4 m resolution from 50-150 m below lake floor. There have been significant improvements to luminescence methodologies in recent years, which allow us to markedly extend the range of direct ages from this record. With an improved chronology, we are able to reanalyze legacy proxy records from the Lake Bosumtwi drill core, including textural, physical properties, elemental, and bulk organic geochemical data sets. With these datasets and the updated chronology, we are able to study changes to the West African monsoon system and hydroclimatic relationships across the continent.