the bicycle was invented in the late Triassic Period but wouldn't become popular for about another 10 million years. Your find could indeed be the tracks of Transportus Schwinagaster.
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1.0.0 Great Plains Ratsnake

1.0.0 Corn, Lavender Aztec het for Amel

0.1.0 Black Ratsnake

0.0.1 Texas Rat (tame)

1.0.0 Broad Banded Water Snake, Hypo

1.0.0 Black Bassador Retriever

2.1.0 Godchildren, 1 Evil, 2 possible hets

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• SNAKE? - Nohope, Mon Oct 27 10:11:01 2008
• RE: SNAKE? - LarryF, Mon Oct 27 10:19:49 2008
• That should be... - LarryF, Mon Oct 27 10:22:24 2008
• RE: That should be... - crimsonking, Mon Oct 27 12:32:52 2008
• RE: That should be... - LarryF, Mon Oct 27 13:50:09 2008
• RE: That should be... - joecop, Mon Oct 27 13:00:53 2008
• RE: SNAKE? - Nohope, Mon Oct 27 14:06:13 2008
• RE: SNAKE? - Trolligans, Mon Oct 27 15:01:37 2008
• RE: SNAKE? - LarryF, Mon Oct 27 17:28:36 2008
• RE: SNAKE? - cochran, Mon Oct 27 16:23:27 2008
• RE: SNAKE? - Nohope, Mon Oct 27 19:05:54 2008
• RE: SNAKE? - BrianDorry55, Mon Nov 3 00:28:32 2008