Contour lines from x-y-z vectors

we have a number of points with x-, y, and z-coordinates. Namely the results from a ground investigation containing data from subsoil drillings to find out the bedrock location (the z-coordinate) at different locations (the x- and y-coordinates). Anyone know how to present them as contour lines using SketchUp (the projection of the iso - z-values on the xy-plane) ?

All the best

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