Origin of the Herman-Norcross-Tintah sequence of Lake Agassiz beaches in Manitoba, Canada

► We use mapping and augering to study the origin of the upper Lake Agassiz beaches. ► Beaches are poorly developed and consist of mostly poorly sorted sediments. ► Each named strandline consists of multiple beach ridges. ► The upper Lake Agassiz beaches in Manitoba were likely formed by storms. ► The age between successive beaches is only 29 to 50 years.