In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Q: In the late 1780s , Derbyshire geologist White Watson made geological picture boards using Ashford Black Marble into which other local rocks were inlaid .
A: 
In the late 1780s Derbyshire geologist White Watson began to create explanatory geological tablets using Ashford Black Marble into which other local rocks were inlaid so as to represent the strata of the rocks in different parts of the county .