Grypania is an early, tube-shaped fossil from the Proterozoic eon. The organism, with a size over one centimeter and consistent form, could have been a giant bacterium, a bacterial colony, or a eukaryotic alga. [2]

Jul 10, 1992 · Hundreds of specimens of spirally coiled, megascopic, carbonaceous fossils resembling Grypania spiralis (Walcott), have been found in the 2.1-billion-year-old Negaunee Iron-Formation at the Empire Mine, near Marquette, Michigan.

May 1, 2017 · Typified by process-bearing Tappania, reticulate-walled Dictyosphaera / Shuiyoushaeridium, and concentrically striated Valeria, these earliest fossil eukaryotes offer key insights into the early evolution of the clade, and enable practical applications to paleobiogeography and biostratigraphic correlation.

The oldest eukaryotic fossil is the multicellular alga, Grypania. Coiled Grypania is found as thin films of carbon in rocks as old as 2,100 Ma in Michigan and young specimens have been recovered from 1,100 Ma rocks in China.

Sep 22, 2022 · The Upper Peninsula of Michigan is home to fossils of Grypania spiralis, which many experts think may be filaments of algae. Grypania appears as spirals on rock that is about 2.1 billion years old. These fossils could be the oldest examples of multicellular organisms and among the first evidence of eukaryotes.

Jun 20, 2019 · Generally accepted to be one of the earliest eukaryotes, these spiral ribbons are also the oldest macroscopic body fossils known to date. The Negaunee Fm. has been dated to 2.11 billion years old, but new studies suggest the unit is 1.87 billion years old.

Grypania is an early, tube-shaped fossil from the Proterozoic eon. It is regarded by some as the first known eukaryote. [2] [3] Grypania's status as a eukaryote is not absolutely proven. It might have been a giant bacterium or bacterial colony.

Oct 21, 2009 · Here we present initial results of analysis of Grypania spiralis, using samples from the US (Greyson Shale, Belt Supergroup), India (Rohtas Formation, Vindhyan Basin), and China (Gaoyuzhuang...

Grypania spiralis (Walcott) Walter et al., a macroalga previously reported in pre-Ediacaran successions, has been collected, together with abundant macrofossils (i.e., the Wenghui biota), from...

Macroscopic “carbonaceous” fossils such as Grypania, Katnia, Chuaria, and Tawuia play a critical role in our understanding of biological evolution in the Precambrian and their environmental implications.