To draw conclusions from the analysis of rock strata and fossils, we typically consider the order of the layers and the types of fossils found within them. Without an actual image or more specific details regarding the layers and fossils, I can provide general reasoning based on common paleontological principles.
If the rock strata show that the leaf fossil is located in a layer that is older than the layers containing fish fossils, then the conclusion would be:
The leaf fossil is older than either fish fossils.
If the rock layers indicate a consistent sequence of marine fossils or sediment suggesting the deposition environment has been an oceanic one, then the conclusion might be:
This area has always been covered by an ocean.
Regarding mass extinction events, these are usually inferred from dramatic changes in the types or abundance of fossils between layers.
Without the specifics of the picture or data, I would advise selecting the conclusion that best matches the evidence you see. If the leaf fossil is indeed older than the fish fossils based on the stratigraphy, that response would be the most accurate conclusion.
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