I believe the park is actually an extension of greenspace connecting Christy Park with the River Des Peres Park. This is corroborated by the Joe Leisure park signs located at Christy and Gravois and Christy and Holly Hills...
St. Marcus Commemorative Park
I used to live near here for years, so this review will have some personal perspective. For instance, there are red tailed hawks and fox that hunt in this area. I cannot seem to find the proof, but I am convinced this part of the city was either a former landfill or common dumping grounds; or maybe when the cemetery was abandoned, it was filled and graded with crude fill dirt. Why?
