Brook Meadow runs off of Holden Road and backs onto Dollis Brook.
Finchley parish lies on a watershed separating Dollis or Brent brook (called Tateburn between 1216 and 1272) and its tributaries on the west from the eastward-flowing tributaries of Pymme’s Brook. The ancient boundary of Middlesex and Hertfordshire in this area followed Dollis Brook to its junction with Mutton Brook.
Most of the area is covered by glacial deposits: boulder clay fringed by glacial gravel overlying London Clay, which has been exposed by the action of streams. There is a narrow band of alluvium along Dollis brook. The resulting soil is a strong marly clay or gravel. In 1871 Finchley became briefly remarkable when excavations for the railway at Church End revealed glacial fossil shells in the boulder clay.
