What drainage pattern indicates underlying fractured bedrock's primary influence on stream orientation?

💡 Explanation

When bedrock is heavily fractured, streams preferentially erode along weakened joint planes because water exploits zones of least resistance, creating pathways through aligned fractures. Therefore, trellis drainage indicates fractured bedrock, rather than dendritic, radial, or braided patterns, which result from uniform substrate, topographic highs, or sediment excess.

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