This visualization displays borehole data as a stacked bar chart, mapping geological layers along the x-axis and their depth on the y-axis. The chart uses a single band scale for the categorical layer, with a linear scale for depth, rendering black rectangular bars via SVG. Built with D3 v5, it loads the dataset from a CSV file, computes scales and axes dynamically, and binds data to rect elements. The example demonstrates basic data loading, scaling, and SVG bar rendering without interactions or responsive updates.