Layer Estimates:

Layer: Boston_Marathon - Trackpoints (ID:0)
Count: 2510
Extent:

XMin: -7961714.0001
YMin: 5195278.9999
XMax: -7912326.9999
YMax: 5213554.0001
Spatial Reference: 102100 (3857)

Layer: Boston_Marathon (ID:1)
Count: 1
Extent:

XMin: -7961714
YMin: 5195279
XMax: -7912327
YMax: 5213554
Spatial Reference: 102100 (3857)