The most appropriate format for the situation presented would be the symposium, since it integrates a group of experts on a topic.
A symposium is a term to refer to a compendium of experts in which different points of view on a topic are exposed and developed through brief individual interventions.
According to the above, the best option to develop a discussion around the discovery of an archaeological site would be the symposium, since the experts on the subject can give their opinion based on their knowledge to establish a decision on the discovery in the most appropriate way.
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