Yes, the SSC people particularly in Kalibangan practiced extended inhumations for young people dying due to unnatural causes like accidents, murders etc. and also for those who were reportedly disabled and consequently neglected by the society. However, for elites and important..
𝗖𝗿𝗲𝗺𝗮𝘁𝗶𝗼𝗻 𝗶𝗻 𝗜𝗻𝗱𝘂𝘀-𝗦𝗮𝗿𝗮𝘀𝘄𝗮𝘁𝗶 𝗖𝗶𝘃𝗶𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻?
S.R. Rao, the excavator of Lothal, in his report "Lothal: A Harappan Port Town (1955-62)", notes that all most all the skeletons found in the cemetery at Lothal belonged to the age-group of 20-30. He notes a complete absence of age groups older than 30 in the burials. It is quite probable as he rightly points out that:
"...that those aged more than 30 were disposed of other than by inhumation. Perhaps they were cremated or exposed to elements."
Rao rightly points out that both the practices of burial and "exposure to the elements", are attested in the Vedic literature to have been practiced apart from cremation. The term "anagnidagdha" in the Rig Veda refers to the disposal of the dead other than by burning.