The Steinheim skull is a fossilized skull of a Homo heidelbergensis found in 1933 near Steinheim an der Murr (20 km north of Stuttgart, Germany). It is estimated to be 250,000–350,000 years old. The skull is slightly flattened and has a cranial capacity from 1110–1200 cc. Others give volumes of (950), 1179±30 and 1270±10 cc. Sometimes referred to as Homo steinheimensis, the original fossil is housed in the State Museum of Natural History in Stuttgart, Germany. Some believe that the Steinheim skull may have belonged to an adult female due to its gracile nature.
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"Steinheim skull | hominin fossil". Can be read here.
Prossinger, Hermann; Seidler, Horst; Wicke, Lothar; Weaver, Dave; Recheis, Wolfgang; Stringer, Chris; Müller, Gerd B. (2003). "Electronic removal of encrustations inside the Steinheim cranium reveals paranasal sinus features and deformations, and provides a revised endocranial volume estimate". The Anatomical Record. 273B (1): 132–42. doi:10.1002/ar.b.10022. PMID 12833273. Can be read here.
"Homo heidelbergensis - Australian Museum". australianmuseum.net.au. Can be read here.