Answer :
The idea that sediments spread out in all directions until they either thin out or run into a barrier can be explained by principle of original lateral continuity of steno's principles.
Nicolaus Steno developed a few fundamental criteria in 1669 that enabled him to make sense of the Tuscany rocks and the different items found within them. Among the first geological ideas, Steno's stratigraphic principles explain how we can examine sedimentary rocks now and determine details about the material at the time of deposition.
Laws of superposition, original horizontality, cross-cutting relationships, and lateral continuity are the four laws.
Layers of sediment are said to originally extend laterally in all directions, or to be laterally continuous, according to the lateral continuity principle. As a result, it is safe to presume that rocks that are otherwise comparable but are currently split by a valley or another erosional feature were once continuous.
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