The topic was "The Geological Timescale is Fiction whose only reality is stacks of rock " which is simply an absurdity from every possible angle.
First, there is no such thing as a "Geological Timescale". There is TIME. There is Geology. They are two entirely different things. Time seems to be one of the properties of space itself.
Second, reality is far more than just stacks of rocks. The rocks themselves have unique properties and characteristics that are in turn evidence of the actual processes and materials that produced them. Those processes and materials are in evidence today.
Third, many rock samples are made from a conglomerate of materials that must have existed as rocks that were over time weathered and eroded into smaller particles before being incorporated in the current format.
Fourth, there are also biological samples included within the rocks themselves. Those samples had to have been incorporated into the rock BEFORE it became a rock. Since they are examples of once living critters those critters must have been living at or near the surface or in the water at a time BEFORE the the rock became a rock.
Fifth, the biological samples are found in ordered vertical states; humans and dinosaurs are never found together in the same rocks.
Sixth, the concept of biological evolution over long periods of time with the same geological processes seen and known today adequately explains the evidence found in reality.
Seventh, no other explanation has ever adequately explained the evidence found in reality.