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Questions related from Paul C. Lyons
Plant fossils come in different sizes and it is important not to overcount the largest ones and overcount or undercount the smaller ones.
02 August 2017 6,449 2 View
Our team has found a number of traces of bristletails, few mayflys, and rarely an unidentified insect. Would appreciate help in the identification of these specimens.
25 October 2016 2,996 9 View
The cycads were the principals food of some of the cycads and were vital to the evolution of the cycads.
01 September 2016 8,651 5 View
Since Darwin's time there has been much paleontological research that either supports or does not support Darwin's theory. Please give specific examples from the fossil record
08 May 2016 4,820 16 View
Both methodologies have limitations. Name some of them.
26 April 2016 4,889 18 View
Maybe the climatic models are misleading, the tectonic models wrong, and the floras not comparable.
28 March 2016 8,697 6 View
One has to consider plate tectonics, the age of the of the volcanic ash or indurated phase (e.g. tonsteins) and that of distant plutons,using a refined technique such as single-crystal zircon...
26 December 2015 5,063 4 View
During the Pennsylvanian, when some great peat (coal) deposits were laid down, all or some of these factors were operating that favored peat accumulation.
21 December 2015 6,154 1 View
It would obviously take a lot of detailed knowledge of the species involved and its paleoenvironment and its biostratigraphy.
17 December 2015 9,343 8 View
In the Latrobe Valley of Australia such unusually thick coal beds exist. Does anyone have any hypothesis on the origin of these brown coal beds hundreds of meters thick?
20 October 2015 7,369 4 View
The plant-eating dinosaurs over the time they existed should have developed a system for dealing with a readily available plant source,that was toxic i.e. the cycads.
28 September 2015 7,243 3 View
We all know there was a variety of plants living at the time of the dinosaurs. However, which plant-eating dinosaurs where eating which plants.
06 September 2015 8,704 13 View
It is known that both dinosaurs and crocodiles occur in the same stratigraphic sequence so that has to mean that they probably shared the same paleoenvioornment. Appreciate your thoughts on this...
04 September 2015 9,429 3 View
Present evidence to show that this is or is not true.
02 September 2015 4,750 3 View
Perhaps they represent energy-related movement or some other related phenomenon.
28 August 2015 3,154 5 View
Map location is a critical part of doing geological field work.
05 July 2015 2,525 9 View
Trap dikes may be either absent of very rare in coal-bearing sequences. Of course their presence is important for paleomagnetic studies.
29 June 2015 1,278 4 View
We know that chalcopyrite contains copper, iron, and sulfur. Can the iron and sulfur be recovered too?
24 June 2015 6,157 8 View
Following the recession of the Wisconsin ice sheet there had to be rebound from the weight of the ice sheet that caused the mantle to depress.
20 June 2015 4,544 11 View
I think many of us have heard various estimates of the thickness of the glacier but what were the methods used and which are the most reliable.
09 June 2015 3,853 10 View
These are common in New England and probably have some value for glacial movement.
01 June 2015 7,472 11 View
We know of a number of hotspots on oceanic plates, but do we know what causes them?
21 April 2015 9,857 5 View
Microscopically, it is easy to tell the difference between biotite and chlorite, but in field work we don't have the luxury of microscopy.
13 April 2015 4,112 4 View
We know that there were great paleoclimatic changes during the Pennsylvanian and Permian. the Pennsylvanian in Euramerica is characterized by great peat (coal) swamps, widespread changes in sea...
09 March 2015 7,396 3 View
These two periods of time were characterized by widespread peat (coal) deposits, great shifts in sea level as observed in cyclothems, and by continental glaciation. What was (were) the driving...
08 March 2015 8,324 17 View
We all know that some Westphalian coal beds are composed mainly of arborescent lycopods. So how do we know what the plant origin is of the rest of the coal?
14 December 2014 1,035 7 View
Explosive volcanic eruptions occurred throughout Palaeozoic time. Under the right set of circumastances they can be preserved in the sedimentary record.
11 December 2014 1,986 22 View
Geologists know that minerals come in a variety of colors and even the same mineral can have different colors. What are the causes of this physical property? One must consider too that the colors...
01 December 2014 9,273 19 View
Has anyone analyzed them? I made a collection years ago and I was wondering if anyone else has thought about the origin of these spheres.
16 November 2014 8,298 3 View
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04 November 2014 1,451 25 View
Dark gray sandstone with planar cross-bedding, cobble conglomerates with clasts partly of a granitoid texture (perhaps syenite), and red claystone or red shale with poor fissility. Sedimentary...
13 December 2013 4,884 12 View
Which elements are organically bound in coal macerals?
06 November 2013 559 4 View
