 The Carrow formation is a predominantly fine-grained redbed (consisting of typically red sedimentary rocks) unit that has a grade ranging from pebbles and cobble in conglomerate at the base to mudstone laced with calcrete at the top.The flow is littered with abundant flows from the Seelys (in the intercaldera sequence) and Rothea (earlier) formation towards the southeast, but in the north metasedimentary rocks, which are sedimentary rocks exhibiting metamorphosis, predominate.The lower part of the formation consists of unwelded and highly compacted lapilli tuff with abundant amounts of pumice fragments.