Good to know. I usually draw such features based on "strength" and context. Easy enough for the mapper to just change the symbol.
Here are the basemap materials for Chestnut Ridge
(with permission from BFLO). There is a 200 DPI gif image of the base at the top of the page.
I see that your control 27 was on an intermittent stream bend. That feature was so weak in the lidar that I used a purple dashed line for it on the basemap
rather than dryditch or stream. Look simply like the bottom of a reentrant. I use purple dashed lines for features I can see but feel are probably too weak to be on the final O-map. Clearly the fieldchecker decided they were strong enough to include, so I was too conservative.
The ocad basemap file
is available too in case you want to look at the other contour intervals.
This image of the spatial distribution of the lidar returns
is kindof cool. You can see the overlapping flight lines. The curvy edges of each line are caused by the plane rolling left and right to stay on track, and the bright and dark stripes perpendicular to the flight direction are caused by the plane pitching up and down, swinging the laser scanner forward and back causing the side-to-side scans to "bunch up" or spread out.