​អ្នកស្រាវជ្រាវ Jan Simek, Alan Cressler, Nicholas Herrmann និង Sarah Sherwood មកពី​សកល​វិទ្យាល័យ Rennessee និង Mississippi របស់​សហរដ្ឋអាមេរិក បាន​ស្រាវជ្រាវ​រកឃើញ​ផ្ទាំងគំនូ​នៅលើ​ផ្ទាំង​ថ្ម ក្នុង​ល្អាង​មួយ នៅ​សហរដ្ឋអាមេរិក ដែល​ផ្ទាំងគំនូ​នោះ​មាន​អាយុកាល​ជាង ៦​ពាន់​ឆ្នាំ​៕

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