Concretions!
Click here to see a photo of one of the Moeraki Boulders (giant septarian calcite concretions, New Zealand). (Photo courtesy of James Boles, University of California, Santa Barbara.)
Click here to see a photo of a concentrically zoned calcite concretion from the Zia Formation, NM.
Click here to see a photo of a dangerous siderite concretion (nucleated on an unexploded shell). The concretion is from a salt marsh in England that was used for weapons testing by the military. (Photo courtesy of Stuart Burley, University of Manchester/British Geological Survey.)
Click here to see elongate concretions from the Sierra Ladrones Formation. These concretions formed parallel to the groundwater flow direction.
Click here to see huge elongate concretions (10 meters long) from the Zia Formation. These concretions formed parallel to the groundwater flow direction.
Local sedimentary rocks and sediments
Sedimentology students generating grain flows at Walking Sands near Socorro, NM.
Click here to see a photo of outcrops of the Santa Fe Group in San Lorenzo Canyon near Socorro, NM.
Local structural geology
Click here to see a large fold along Arroyo del Tajo, east of Socorro, NM. Students for scale.
Click here to see cleavage refraction in Proterozoic metasediments, Manzano Mountains, NM.
This photo shows preferential cementation of the Sand Hill fault by calcite. Because the sediments outside of the fault zone are unconsolidated, the cemented fault forms a wall. See the faults and fluid flow home page for details.
Links to other Tech photo collections
Click here to see some additional E&ES photographs.
