Significance of Early Structural Temples
Few structural temples from this early period have survived due to perishable materials (wood, mud-brick) and later rebuilding. They are characterized by simple, basic layouts with a small, square sanctum (Garbhagriha) and a small, flat-roofed porch (Mandapa).
The Besnagar (Vidisha) Heliodorus pillar (2nd century BCE), associated with a Garuda-dhvaja erected in front of a Vishnu temple, indicates the presence of such temples even if the structure itself is lost. This represents the crucial nascent stage of Hindu temple architecture, moving from temporary shrines to permanent, dedicated structures.