Layer Estimates:

Layer: RomanWall (ID:0)
Count: 1
Extent:

XMin: 99464.6105999984
YMin: 6779849.5244
XMax: 101077.776299998
YMax: 6780807.8817
Spatial Reference: 102100 (3857)

Layer: RomanCityBlocks (ID:1)
Count: 43
Extent:

XMin: 99522.2705000006
YMin: 6779872.2153
XMax: 101037.367199998
YMax: 6780764.5827
Spatial Reference: 102100 (3857)

Layer: Contour_Colchester_4 (ID:2)
Count: 18625
Extent:

XMin: 1.11305657984171E-05
YMin: 6621293.72270483
XMax: 111319.490782158
YMax: 6800125.45432505
Spatial Reference: 102100 (3857)