| The most significant physiographic influence on the basin was the ancient sea. |
| Data Sources: Several well-known geographical texts contain physiographic regions. |
| It lies within the Valley and Ridge physiographic province which is characterized by a predominance of dolomite and limestone interposed with shale and sandstone. |
| Regional boundaries are determined by noticeable changes in the spatial distribution of physiographic and ecological features. |
| Each ecoregion is defined by physiographic features, dominant vegetation and climate. |
| Study sites were located in floodplains of the upper Passaic River basin in the Piedmont physiographic region of New Jersey. |
