Julius himself could have taught you how to build a proper campfire. Yes.
There seems little doubt to me that this photograph was taken along Pigeon Brook.
This is a photograph found in the New York State Archives. It was probably taken in 1920, and forstmann is third from the left. Here's what the archive notes say: "View of seven men standing in a forest by a stream watching an eighth man start a campfire. The original caption for this photograph reads: 'Forstman party - not for CC fires.' Julius Forstmann owned a large estate in Denning, Ulster County in the Catskill Mountains, and the third man from the left appears to be Forstmann. The date is unknown, but may be ca.1920. This image was created to record the forest fire prevention activities of the New York State Conservation Commission."