405,000 year cycle in Earth Eccentricity found in 215 million years of climate

One of the four main Milankovitch cycles is a 405,000 year fluctuation in the Earth’s orbital eccentricity. This means that the Earth’s orbit gets more and less circular over that period, affecting the extremes of climate. The variation is due to the effects of Jupiter and Venus which are the two planets with the greatest tidal effect.


“Rhythmic climate cycles of various assumed frequencies recorded in sedimentary archives are increasingly used to construct a continuous geologic timescale. However, the age range of valid theoretical orbital solutions is limited to only the past 50 million years. New U–Pb zircon dates from the Chinle Formation tied using magnetostratigraphy to the Newark–Hartford astrochronostratigraphic polarity timescale provide empirical confirmation that the unimodal 405-kiloyear orbital eccentricity cycle reliably paces Earth’s climate back to at least 215 million years ago, well back in the Late Triassic Period.”

“The Newark–Hartford astrochronostratigraphic polarity timescale (APTS) was developed using a theoretically constant 405-kiloyear eccentricity cycle linked to gravitational interactions with Jupiter–Venus as a tuning target and provides a major timing calibration for about 30 million years of Late Triassic and earliest Jurassic time. While the 405-ky cycle is both unimodal and the most metronomic of the major orbital cycles thought to pace Earth’s climate in numerical solutions, there has been little empirical confirmation of that behavior, especially back before the limits of orbital solutions at about 50 million years before present. Moreover, the APTS is anchored only at its younger end by U–Pb zircon dates at 201.6 million years before present and could even be missing a number of 405-ky cycles. To test the validity of the dangling APTS and orbital periodicities, we recovered a diagnostic magnetic polarity sequence in the volcaniclastic-bearing Chinle Formation in a scientific drill core from Petrified Forest National Park (Arizona) that provides an unambiguous correlation to the APTS. New high precision U–Pb detrital zircon dates from the core are indistinguishable from ages predicted by the APTS back to 215 million years before present. The agreement shows that the APTS is continuous and supports a stable 405-kiloyear cycle well beyond theoretical solutions. The validated Newark–Hartford APTS can be used as a robust framework to help differentiate provinciality from global temporal patterns in the ecological rise of early dinosaurs in the Late Triassic, amongst other problems.

The 27-My Newark–Hartford astrochronostratigraphic polarity timescale (APTS) (1) is one of the longest continuous APTS segments presently available and calibrates much of the Late Triassic and earliest Jurassic geologic timescale. It relies on the geomagnetic polarity and cycle stratigraphies of over 6,900 m of coring in the Newark basin (24) and an overlapping 2,500-m-thick outcrop section in the nearby Hartford basin (5), both in eastern North America. The composite continental record is paced by 66 McLaughlin lithologic cycles spanning 27 My of the Norian and Rhaetian of the Late Triassic and Hettangian and Sinemurian of the Early Jurassic, reflecting the response of climate to the long astronomical eccentricity variation with a presumed 405-ky period. The 405-ky period cycle is related to the gravitational interaction of Jupiter and Venus (g2–g5 cycle) and is the prominent and most stable term in the approximation of eccentricity of Earth’s orbital variations on geologic timescales despite chaotic behavior of the Solar System (6). The record also encompasses 51 Poisson-distributed geomagnetic polarity intervals (with an additional 15 polarity intervals in the fluvial noncyclic sediments toward the base of the section, which by extrapolation of sediment accumulation rates extend the record an additional ∼6 My into the Carnian), providing a template for global correlation. However, the astronomically paced polarity sequence is anchored at essentially only one level. High-precision U–Pb zircon dates in lavas and intrusions of the Central Atlantic Magmatic Province (CAMP), which are clustered in close spatiotemporal proximity to the Triassic–Jurassic boundary (7), were collapsed to a calibration age of 201.6 Ma for the onset of Chron E23r close to the base of a McLaughlin cycle (Ecc405: k = 498.25, where k is the inferred number of 405-ky eccentricity cycles projected back from the most recent maximum at 0.216 million years ago as k = 1), which immediately underlies the oldest CAMP basalts. In the absence of other directly dated horizons, the APTS relies on the assumption of a continuous section with no substantial hiatus(es) in deposition of these continental sediments, which would potentially result in one or more unrecorded 405-ky cycles. The specific timing of the APTS is also dependent on the untested reliability at this distant age range of the 405-ky cycle.

The developing APTS has been successfully used for global correlations in marine and nonmarine facies (e.g., refs. 8 and 9; see ref. 1). Nevertheless, there have been persistent suggestions made largely on the basis of nonmarine biostratigraphic correlations that several million years of Rhaetian (latest Triassic) time are missing in a cryptic unconformity that supposedly occurs just above Chron E23r in the Newark Supergroup basins (e.g., refs. 10 and 11). If true, this would have consequences of comparable magnitude in the timing of events based on anchoring the astrochronology below the alleged cryptic unconformity to the U–Pb-dated CAMP lavas above it. Therefore, a test is needed of the conjoined assumptions of stratigraphic continuity and the 405-ky periodicity for the long eccentricity cycle that are implicit in the construction of the Newark–Hartford APTS.

The Late Triassic-age Chinle Formation (Fm.) of the American Southwest (Fig. 1A) consists of fluvial and minor lacustrine facies interfingered with paleosols and, importantly for the task at hand, has numerous sandstone horizons with volcaniclastic detritus containing detrital zircons amenable for U–Pb dating (12). The Black Forest Bed (BFB) within the Petrified Forest Member (Mb.) of the Chinle Fm. at Chinde Point in the northern sector of Petrified Forest National Park (PFNP) was the first unit to be successfully U–Pb zircon dated in the PFNP section (13). Recent high-precision U–Pb zircon dating of the BFB (12) made it an attractive target for calibration of the APTS. Sampling of outcrop sections demonstrated the feasibility of obtaining a magnetostratigraphy (14) even though revised long-distance lithostratigraphic correlations of the Sonsela Mb. of the Chinle Fm. (15) indicate that there may be a large gap in the composite magnetostratigraphic section. A main scientific objective of the inaugural drilling effort of the Colorado Plateau Coring Project (16) at PFNP (core CPCP-PFNP-13-1A; henceforth PFNP-1A) (Fig. 1B) was to obtain a magnetostratigraphic sequence directly supported by high-precision U–Pb detrital zircon dates for the Chinle Fm. with unequivocal superposition and a diagnostic polarity signature for correlation to the APTS. Here, we report on paleomagnetic and geochronologic results from the upper ∼280 m of the 519-m-long core recovering a section of the Chinle Fm. down from the lower Owl Rock Mb. to the Mesa Redondo Mb., the Moenkopi Fm. and the uppermost Coconino Sandstone”


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COVID19 Effect on CO2 levels

Previously I have published articles showing that CO2 change does not cause temperature change but the other way around. Temperature change actually leads CO2 change by 6 months. Which Causes which out of Atmospheric Temperature and CO2 content?

The covid19 pandemic is a terrible thing for the world, but does give a unique opportunity to study industrial production effect on CO2 levels. It has been reported that pollution has dropped by huge amounts over China and then Europe as lockdowns brought industrial production almost to a halt. In America the FED has predicted a 50% drop in GDP in the second  quarter of 2020. See below for links.

It seems safe to assume that this will mean a drastic reduction in human produced CO2. If the theory that humans cause CO2 change and temperature change is correct, then we would expect a big drop in CO2 levels to happen immediately. If my (and others) theory that temperature change causes CO2 change then CO2 levels would not be expected to respond in the same way.

Here is the historical level of CO2 in ppm as measured in Hawaii from 30 March 1958 until 26 March 2020. Clearly CO2 has grown dramatically and at an accelerating rate. There is an obvious yearly cycle also, but it is not totally consistent in the time of year (you can’t see this without analysis).


The growth in CO2 is not consistent in each year, for example there is a faster rise just before 1991 compared to just after. In my previous study there was a multiyear fluctuation which might relate to the ENSO (El Nino Southern Oscillation) weather cycle.

To get a measure reasonably free from the annual cycle and rapid growth in CO2, we can compare the present level of CO2 to 365 days earlier. This is shown here.

CO2 -change-365d-l

The scale is considerably expanded here, but it can be seen that there is a fluctuation of period a few years, which is possibly due to ENSO. Let us now look at the last few years of this graph in detail.

CO2 -change-365d-s

The cycle of a few years can be seen to have peaks in early 2016 and early 2019. From 2020 February to 2020 March there is an increase in CO2 compared to a year earlier which is higher then the other recent values. The change in CO2 over the 365 days is around 4.5 ppm. This compares with a typical increase of about 3.5 ppm in recent years and only about 1 ppm back around 1960 when the data began to be collected.

So the big drop in CO2 expected from human emissions is actually a slight increase. I don’t know how to quantify the industrial reduction over the last two months, but I expect it to be in the tens of percent. That should show up as a reduction in CO2 by about 2 or 3 ppm compared to what is actually showing.

No doubt some measures of industrial production and CO2 emissions will become available in the coming months or year. Also, global temperatures will be reported and we can see if that has changed its trend. If it has not reduced temperatures, then the whole climate crisis story will be seen as having no basis in fact.

Some links relating to pollution reduction from covid-19:

New Evidence Shows How COVID-19 Has Affected Global Air Pollution

Has Covid-19 helped ease air pollution?

Coronavirus quarantines have reduced air pollution in China. An expert says that won’t last long

expert reaction to drop in air pollution because of COVID-19


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Rhythm is Slow Chords

In the early 1990s I had mentioned that the key that music is played in and the tempo might well be related because tempo can be thought of as a very slow note. To understand this, Let us for simplicity assume that a piece of music is in the key of C and that the frequency of middle C is 256 Hz (cycles per second). Then as we go down by an octave at a time, successive Cs will have frequencies in Hz of 128, 64, 32, 16, 8, 4, 2, etc. Now 2 cycles per second is the same as 120 cycles per minute. It might be the case that a piece of music is intended to be produced at a tempo of 120 beats per minute. In that case we may say that the tempo is in the same key as the music.

With harmonics theory I expect that after every two or three ratios of 2 (that is, moving down an octave) there might be a ratio of 3. So in that case the tempo would be 80 or 160 bpm (beats per minute).

My own investigations of some great composers such as Mozart and Beethoven found that they very often did match up key and tempo. But not all composers do. One problem is that the tempo is often not specified accurately enough for our purpose. However I found that Billy Joel specified the tempo accurately and of course we have his recordings to check. He also matched tempo to key. By match I mean that the tempo is either a number of ratios of 2 slower than the key note frequency, or possibly with one ratio of 3 also. On reflection it is possible that a second ratio of 3 should also be allowed.

Not long after I first mentioned this on internet, someone (I forget who. If it was you, please remind me) wrote to me saying something like “someone else has been thinking your thoughts”. They supplied a link to a web site by Stephen Jay and indeed he had been thinking very similar thoughts. He had gone a little further in identifying chords in the commonly used rhythms. Unfortunately after a while his web site disappeared.

A couple of days ago I was thinking about this and remembered the Internet Archive or Wayback Machine which lets you see the internet as it was years ago. Putting in the old link I found the web page existed until the late 1990s. But then I did a search and found that Stephen Jay was mentioned in Wikipedia and had a Web Site which included the Original Article.


Stephen Jay. Read his article on The Theory of Harmonic Rhythm.

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Mass Killings in USA

Once again there have been media reports of mass killings by gun shots in USA. Actually, they are more or less a daily occurrence now, it is just the reports that are sporadic. Here is a report that shows the number of mass shooting events each day for 2015 so far:

Shooting in Oregon: So far in 2015, we’ve had 274 days and 294 mass shootings


Actually there is a web site with a further two years data but it needs to be collated into the same form of daily totals before analysis can be done.

Are there cycles in mass shootings? What could cause variations in their occurrence? These questions were examined. This is a spectrum of cycles present in the above 9 months of data. Cycles periods in red are significant except the 365 day one.

mass-killings-cycles-spectrumWe may take the two most prominent cycles of 6.99 and 3.494 days as being a week and half a week. This is not surprising as people’s habits vary greatly by the day of the week. Further analysis shows that there is little difference between the five week days, but compared to them Saturday has 100% more mass shootings and Sunday has 140% more. It reminds me of the old saying “the devil finds work for idle hands”.

As there is only 9 months data, we cannot say that there is a 365 day cycle but it seems quite likely, as seasonal weather patterns play out. There are more killings in the summer months. The other three cycles of 17.35, 5.96 and 2.64 days do not seems to be related to any commonly know cycles.

Combining the above cycles to see how they fit the original data also allows a possible projection. Ideally a longer base period would be used for this, but we can look and see whether or not the future follows the past patterns.

mass-killings-cycles-fitSadly, we can expect many more mass killings in the future.

The original data and explanations are available here as well as further data going back several years.

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How the Sun affects our Minds

One of my absolute favourite Cycles Researchers was Alexander Chizhevsky. We have an article about him on CRI, but this one has much more details of his life.

How the Sun Affects our Minds.

It begins…

More than three-quarters of all instances of human unrest—battles, upheavals, riots, revolutions, and wars—occur during the periods of the maximum number of sunspots in the Sun… So powerful is this cosmic zeitgeber that it may even influence our physical size, our longevity, our mental stability, our propensity to violence, and possibly even what we consider our uniquely individual motivation…

One of the most important conclusions is Chizhevsky’s discovery went beyond periodicities and cycles, for he had uncovered a sobering truth about the human condition: we are not completely in charge of our own destiny.

I would go further and say that we are not at all in charge.

Please read the article. My own conclusion about how the Sun affects our minds is as follows:

The solar wind comes past the earth at about 300 to 700 kilometers per second and fluctuates dramatically. This causes the earth’s electromagnetic field to ring like wind chimes in the wind. The natural frequency of the earth’s electromagnetic field is 8 cycles per second, called the Schumann resonance as that is the rate for electromagnetic waves to travel around the earth. That frequency is right in the middle of human brain wave frequencies so we can understand how the sun affects us.

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Rabbits, Diseases and Cycles

(Originally posted in September 1997 with the comment “This will no doubt become topical again some time”.)

In recent times there have been many news reports concerning the problems of rabbits for farmers in the south island and the release of rabbits contaminated with the RCD rabbit virus. I am writing because I have some information which might be of relevance to the problem, and without which some mistaken conclusions might be reached.

There is a cycle of 9.6 years in snowshoe rabbit populations in the northern hemisphere. Many other animals show this same variation, including Canadian Lynx, hawk, owl, partridge, tent caterpillars, chinch bug, ticks, coyote, fisher, martin, mink, muskrat, four varieties of fox, timber wolf, goshawk, skunk and salmon. In most cases the variations in animal populations and reproduction rates vary by enormous factors over the 9.6 year cycle. For example the Canadian Lynx population increases by about 1000% in 5 years and just as rapidly declines to its original level. A graph of the Canadian Lynx population, as measured by the number trapped for fur, and covering a 200 year period is enclosed. Humans too are slightly affected by the 9.6 year cycle with a variation in heart attacks.


These matters have all been reported extensively by Edward Dewey and others at the cycles foundation over a long period. Other variations over a cycle of 9.6 years include wheat production, tree ring widths, financial crises, storm track shifts, magnetic measurements, lake varve thicknesses, atmospheric ozone content, atmospheric pressure and the runoffs of certain rivers.

I recently came across an old book with some further interesting material related to the matter. Ellsworth Huntington reported in the 1940s that ozone concentration in the lower atmosphere also varies over the same cycle and that some solar variations are suspected to be responsible. It is also known that litter sizes and breeding frequency increase considerably as the growth phase of the cycle gets under way.

Huntington makes it clear that we do not fully understand these things but offers clues for further research.

Some research on the various creatures affected by the cycle has been carried out because several others are pests as well as rabbits.

Although there is no certainty on the cause, the suspected culprits of weather variations and such factors are not the primary cause of variations.

The question of relevance to farmers is whether epidemics of rabbits can be predicted and, that being so, whether anything can be done about it.

The other important question is what would the natural cycle be doing at the moment without the RCD rabbit virus. All of the animals whose populations vary on a 9.6 year cycle reach peaks at nearly the same time. This is called cycle synchrony by Edward Dewey and is common to other cycles also. There are other cycles of different periods in other animal populations and in many other variables.

Extending forward the dates of the peaks of the various animal populations from the historical records of the 9.6 year cycle leads me to conclude that they would mostly reach a peak around early 1996. On that basis, assuming that our southern hemisphere animals follow the same cycle then it is quite understandable that there has been a serious problem for farmers over the last several years. However, even without the release of RCD rabbit virus we could expect a reduction in rabbit populations to already have begun and for rabbit populations to decline significantly through 1997 to 1999 and reach a low around the end of the year 2000.

It concerns me that even if the rabbit population just follows its normal decline this may be interpreted as being a result of using RCD and so RCD may acquire a reputation whether or not it deserves it. For that reason I wanted to make the facts about animal population cycles known so that when MAF and others are reaching their conclusions at some time in the future they will put this information into the equation also.

(originally posted 31/01/07 on Wobbly Universe blog by Ray Tomes and then I commented later)

This is unbelieveable! It was 9.4 years ago that I wrote this article at the peak of the last rabbit cycle in NZ. Only yesterday I posted it to my blog, realising that the cycle of 9.6 years was due. Today on the TV news there is a report of massive numbers of rabbits in Southland.

I should add that I wrote this article originally and sent to TV presenter Paul Holmes who did not reply. Visit my Just Thinking blog (under links to the right) [Now defunct] for other ignored correspondence with the media.

Then again I sent a message that was ignored:

I just sent the following email to TV3 presenter John Campbell:

Dear John

I love your show and your enthusiasm. Great!

About nine and a half years ago I sent a fax to Paul Holmes about the Rabbit infestation and the fact that a cycle in rabbit population of 9.6 years was known in the Northern hemisphere. It got ignored (it is normal it seems, my letters to the NZ Herald and NZ Listener also all get ignored).

You might like to look at the info about this on my blogg at http://ray.tomes.biz/b2/index.php/a/2007/01/31/rabbits_diseases_and_cycles

The amusing thing was that 9.4 years after I wrote the article, and 1 day after I posted it to my blog there was a TV News item that the rabbits were back.

Best wishes
Ray Tomes

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One Man’s Cycles in Epilepsy

A few years ago my friend John Simpson gave me a copy of his data records of epileptic seizures that he had over the period January 2004 to June 2011. For each seizure he recorded whether it was grande mal or lesser seizure, which were recorded as 2 or 1 respectively. All other days were recorded as 0. At the time I did some cycles analysis of his data and there were very significant cycles, and lots of them. Recently I asked him if I could put the information on Cycles Research Institute blog and he said yes.

On the face of the data record, the seizures seems to be rather randomly scattered in time. However a spectral analysis shows that there is considerable order in the timing. Here is the spectrum:

epilepsy-spectrumThe figures in red are the cycles period which were significant at the 0.05 level. Probably many of these are not real, but many will be. The outstanding period is the 16.672 day one. It has p=0.000128 which means that such a cycle would be present only one time in 8,000 if the data were random.

The cycles periods found do not generally correspond to any well known cycles periods such as solar or lunar. Perhaps the cluster around 7 days is related to the Sun because the Earth is hit by more solar wind particles typically every 7 days due to the Sun rotating.

This would tend to suggest that the periods are mostly due to internal processes in John’s body. It is surprising that such a cycle could be very regular, and yet the 16.672 day cycle is so regular that the seizures are concentrated in half the cycle and especially in a few days, with one week of the cycle rather free of seizures.

This graph is prepared by wrapping time in a loop every 16.672 days as it were, so in 2004, January 1 is on the left through to 17th on the right. The 18th will appear about 1/3 of the way between 1 and 2 January and subsequent days at one day interval. After each multiple of 16.672 days the data is re-entered from the left. I call this type of analysis “wrap”. It is useful for seeing the average shape of a cycle.

epilepsy-16.672-day-cycle-notesThe scale at the left is the probability of a seizure on that day of the cycle, without grand mal counted as two. It can be seen that the peak days are over 5 times as likely to have seizures as the trough days, and more than 3 times as likely as the whole trough week.

A search of the internet for epilepsy cycles brings up many pages. For women about 10% to 12% have a form called catamenial epilepsy which follows the hormonal cycle. No monthly cycle is noticed for men. It is thought that hormones play some part, but this is not fully understood.

It is reported that seizures are often clustered in time, there being a burst in a short period and then none for a while. Such distribution will make cycles appear to be more significant than they are, or even make them appear when they are not. However that is not true of the dominant cycle here.

I found a report of one young man having a cycle of 10-12 days in seizure clusters. That is not so greatly different from John’s. He did not mention to me that he had noticed any periodicity. It may be that the seizures are not happening every cycle so the intervals might be 17, 33, 17, 50, … days which would not be obviously apparent.

John reports to me that he no longer has any grande mal and no longer keeps a log. Thank you for sharing your data with us John.

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