For more than two decades, crop circles have been studied thoroughly. Various fields of study have joined in the research and the outcome is simply staggering. I do not intend to provide a full and complete overview of the research on this website. However, I will give some insight in the so-called 'anomalies': strange things that urged science to finally deal professionally with the mystery of crop circles.
This overview is short but to the point, elaborated per anomaly. For more information, I recommend the website of the BLT Research Team.
By clicking on the pictogram of the anomaly of your choice, you'll be travelling straight away to the pages you wish to visit...

No seeds

Elongated and exploded nodes

Bent nodes

Bent stems

Twisted plants

Torn off plants

Bundling

Anomalous germination and growth patterns

Traces of heat

Dead flies

Ghosts

Anomalous substances

Magnetite

Other effects on the soil

Atmospheric phenomena