Field Geology

All photos and images posted on this page were taken by me. Feel free to use these photos for non-commercial purposes (e.g., teaching) with appropriate references.

Anticline in Newfoundland, NJ.

Sitting on Cambrian stromatolites, Hamburg, NJ.

A huddle of Rutgers geologists around a diabase boulder, Elverson, PA.

Trace fossils, also known as ichnofossils, in a deltaic deposit, South Kalimantan, Indonesia.

Another view of the Cambrian stromatolites of northern NJ with some rip-up clasts.

Deformed polygonal structures in fine-grained carbonate rocks.

Cleavages and folded rocks. See how cleavages in the incompetent layers (i.e., shale) converge, whereas cleavages in the competent layers (i.e., sandstone) diverge.

Fault contact between red shale (left) and limestone (right). Jayapura, Papua, Indonesia.

Cross bedding in sandstone. Do you know you can determine the direction of paleocurrent from this sedimentary structure? Locality: South Kalimantan, Indonesia.

A good example of en-Ă©chelon fractures. This type of structure commonly forms along a simple-shear zone. Delaware Water Gap, NJ.

Unconformity between Pre-Cambrian gneiss (basement rocks) and Cambrian Quartzite (Hardyston Fm.). Gneiss shows subvertical foliation. Hamburg, NJ.

Glacially polished rock surface. These striations formed during the last glacial period (20-15 ka). Delaware Water Gap, New Jersey.

A slickenside is also an example of a polished rock surface. Unlike glacial striations, slickenside is a planar, polished surface that formed during faulting and commonly associated with tectonic activity. Delaware Water Gap, New Jersey.

Desert Varnish & Petroglyphs. Desert varnish is a thin layer of clay minerals, oxides, or hydroxides of Manganese and/or Iron that is commonly found in exposed rocks in arid regions. American Indians use this coating as canvasses to carved petroglyphs onto the rock surfaces. Location: I forgot! Somewhere in Utah, please submit a comment if you know the name of this site. Mr. Leon Taufani as a scale.

Sitting in front of an exposed Eocene-Oligocene sand body of Tanjung Formation, Barito Basin, South Kalimantan, Indonesia. Note the presence of thin coal layers. Deltaic deposits?

Comment Sections