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G.C. Herman's Earth-Science Blogs 

2022 Punctuated Tectonic Equilibrium
Extinctions, bolide impacts and LIPS
2022 Passive drift, wrinkling crust, and cracking plutons of the New York Recess, USA
Arches and troughs
2022 The Vredefort astrobleme, mantle plumes, core pipes, and tectonic-plate driftAfrican core pipe
2022 Aspects of a Nasca Hillside Ceremony Site used for 'Moche Toss'
A Nasca sporting complex
2021 Three, suspected, large-bolide impacts in the South American region with estimated ages of 16 Ma, 24 Ma, and 124 Ma.
The Three Amigos
2021 Stone mounds
atop Cushetunk Mountain

2021 Zoom talk
   2021 Paleo-Indian Clovis point GH1 from along the Susquehanna River North Branch
Clovis point
2021 Earth's mantle as an electromagnetic-field component, with implications for geomagnetic reversals
Toroid and poloid
2021 One bad period
on Earth about 800,000 B.P.

Suspected Australian impact strewn field
2021 Structural traces and tectonic aspects of 13 Martian astroblemes  
Two antiipodes
2020-21 Impact experiments using an air pistol, steel projectile, and 60mm glass balls
Impact experiments
2020 Old Pacific Mayhem; Three Suspected Bolide-Impact Events of Cretaceous Age with Global Consequences 
Old Pacific mayhem
2020 Mid-Cenozoic Tectonic Disruption of the Central Appalachians by the Chesapeake Invader
Chesapeake impact
2020 Impact Tectonics;
Beyond the Craters
 
Chicxulub-Chesapeake

2020 Return to Devil's Gate 
Alamo impact and Western USA gold fields
   
2020 The Hydrogeological and
Tectonic Nature of the Nazca Lines
  
Nazca Lines

2020 Some physical aspects of the Giza pyramids: Old-Kingdom Science and Engineering
Khufu construction machine

2014 Google Earth Continental Geology by Era and Sea-Floor Physiography   
Continental geology by Era
2019 3D SketchUp and
Google Earth Model of the Yellowstone Calderas and Farallon Plate

Yellowstone-Farallon plate

2007 Plate splitting impact in the Congo Basin; bedrock geology, plate motions and diamonds  
Suspected Congo Basin impact
2010 2 Known and 6 Suspected Large-Bolide Impacts on Earth, with Plate Boundaries and Current Plate GPS Horizontal Velocities  Some known and suspected impacts