The paper establishes the Himmerkinlahti Interfacings Member, which is a thin metamorphosed conglomerate-sandstone unit within the middle part of the early Proterozoic (Karelian) supracrustal sequence of the Kuusamo Belt, northern Finland.Polymictic conglomerate beds with intra-Karelian supracrustal and (meta)diabase clasts and abundant hematite mineral clasts characterize the member.The latter represent intercumulus oxide phase of the (meta)diabases.The member also includes hematite-laminated lithic sandstone interbeds.
The Himmerkinlahti Member is interpreted Household to represent a minor coarse-grained alluvial braid/braidplain delta and is evidence of a period of significant subaerial erosion during deposition of the early Proterozoic Karelian formations in northern Finland.Its rocks are likely part of a lowstand prograding wedge of type 1 sequence of the Kuusamo Belt.