In the 19ᵗʰ century,the geologic time scale was based primarily on sequence of fossils in the rock record.

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This is true. The geologic time scale was initially developed based on the observation that different rock layers contained different types of fossils, and that these fossil sequences were consistent across different rock outcrops. This allowed geologists to correlate rock layers from different locations and develop a timeline of Earth's history based on the relative ages of these rock layers. Later, the development of radiometric dating techniques allowed for more precise dating of rocks and further refinement of the geologic time scale.

In the 19ᵗʰ Century,the Geologic Time Scale Was Based Primarily