It's the fifth by seventh century CE when outer design and appearances of Hindu temples in north India and south India began to commonly diverge. It is usually believed that this temple has Swayam-bhu of Lord Hanumana which means that Hanumana himself experienced appeared below. It is usually mentioned the https://medium.com/@HinduTempleAdelaide/hanuman-temples-and-hindu-worship-in-adelaide-b290655032c7