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I always wondered about the oil film that can be observed between the pond and the upland when exploring the wildlife sanctuary Hall's Pond in Brookline. I remember when I encountered the oil film the first time I was very worried about some kind of pollution but the opposite is true. From the Hall's Pond brochure I quote: This area is a wooded wetland, where trees grow on mounds of soil and water collects during wet seasons. Peat soil lies under the area and as this material decomposes, ... Learn More.