Foraminifera - Science topic
An order of amoeboid EUKARYOTES characterized by reticulating pseudopods and a complex life cycle with an alternation of generations. Most are less than 1mm in size and found in marine or brackish water.
Questions related to Foraminifera
We know that Forensic ecology can be used by applied microfossil proxy, called palynology.
What do you think and if there is some papers that explain how can investigate the forensic ecology by using foraminifera fossil?
I am seeking advice for something I found in sediment samples of a Norwegian fjord.
The sediment samples were taken at approximatley 40 - 50 m water depth and contain something that we firstly classified as foraminifera. Quickly we decided that it must be something else and were unfortunatley not able to find out what until today. It could be another microfossil, some biogenic particle such as an egg or maybe even something anthropogenic. The shape has always the same size of about 150 µm, appears throughout all of our sediment cores and seems to be more abundant at 1 m depth than at the top. It has a calcareous "shell" and contains a honey-like substance. I am attaching pictures taken with a light microscope.
I would be happy to solve the mistery and find out what this might be!
Hello, need some help with these (figures attached).
The surface is very shiny and seemingly smooth, test is quite brittle, all broken, but apparently something attached to substrate and composed of branching globular chambers.
Sea bottom sediment sample taken from Sea of Marmara, about 200 meters water depth. Sample also includes abundant calcareous foraminifera (e.g. Bolivina and small Cassidulina) and a few echinoid spines.
Sorry for the poor image quality. One large Bolivina (about 500 microns long) is present in the last pic for size comparison. Appreciate all the help!
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The specimens in the photo come from the upper Cretaceous part of the sediments from the Polish Outer Carpathians. They resamble A. mayaroensis, but in the assemblage the specimens were found in no other Maastrichtian index taxa were found. Also, all the forams are not well preserved, so there's a change I missed something.
Dear colleagues, can anybody help me in the foraminifera genera or species identification? never seeing anything like this one. I suppose it is Nonion sp.
thanks for your answers,
The morphological features seem to be identical in the axial section of both foraminiferas. What diagnostic identification features can differentiate both species?
I want to use the "Modern analog technique" for SST at different depths. I have Planktonic foraminifera data but I am confused about how to use the "Modern analog technique". If someone guides me it will be appreciated.
After measuring the δ18O of forams, how to apply correction in the δ18O value caused by variations in the global ice volume, which in turn induces a change in the δ18O value of seawater and so also the calcifying foraminifera shells?
I am having challenges in terms of where to buy foraminifera cardboard microslides (plummer type), the aluminum holders, etc. My regular vendor (greengeo) is not responding due to health issues. Any suggestion for a vendor in the USA?
Stay safe and thanks.
I can't identify these two bioclasts (yellow arrow)in the thin section I'm analyzing. The overall thin section is made up of angular to sub-rounded grains of feldspar with alterations, zonations and twinnings, opaques, lithics and quartz. The thin section was from an area believed to be Jurassic-Cretaceous Tembeling Group based on findings of poorly preserved horsetails in the area. The Tembeling Group is a continental deposit. But the bioclasts seem to be of marine in origin?
The three sections on the bioclast on the left got me thinking that it was a trilobite but I'm not sure. Or could it also be a foram?
Hi all, our recent work into the use of electric pulses to disaggregate indurated limestones, allowing fast (minutes) recovery of foraminifera is now available open access on the link below, check it out!
#fossils #climate #oilandgas
I'm dealing with Upper Cretaceous microfossil association that consists of ostracods and foraminifera. Source material – sandstone and marly limestone – was disintegrated in water with some Hydrogen Peroxide (30%) added to solution. The problem is that microfossils are not totally liberated from the rock and still have pieces of it attached to their carapaces and tests.
Can somebody please give me some hints on how to remove unwanted material?
Recentemente constatou-se que em esgotos foram encontrados amostras de corona vírus. O esgoto ou a falta dele e uma das causas de contaminação de lençóis freáticos.
I will appreciate if someone of foraminifer experts can help me to identify these species. I am copepodologist, but now met foraminifers in the sample from Amundsen Sea and have to know what the species they are? I guess might be that one, the spinose species, looks like Globigerina falconensis?
Thank you in advance,
I found in thin sections of shales, which have suffered metamorphism, small and circular shaped objects, which original composition was replaced by very low metamorphism minerals, and in some cases they contain opaque minerals (must be pyrite).
Some of these objects are totally filled, but some of them are just rings with an empty center. Some of them are individual spheres and others are made up of two spheres at most. I only found one made of 3 spheres.
I didn't identify any morphological characteristic in the walls to determine them easier. I assume that, if they ever had it, they lost it during metamorphism.
- I have determined them as foraminifera, Globigerinida order, but I want to discard thay they are calcispheres, because sometimes they look very similar, As far as I know, calcispheres are made of single spheres, not 2 or more. But i want to know it from you experience.
Photos were taken with 20X and 40X objectives.
-- Thank you for your answers! --
I’m doing a project about diatom and foraminifera.
I’m going to use agar/agarose plating to culture diatom. As far as I know, agar usually used for plant culture, and agarose for protoplast. Moreover, I know that Kei Kimura & Yuji Tomaru (2012) have published a unique method for culture diatoms.
But what’s the difference between agar and agarose plating to culture diatoms?
Hope to get some answers and suggestions.
I am bit confused about which clustering method to use? I have collected sediment samples from an outcrop from old to young (constrained), my samples are hand picked specimens. I wan to run cluster analysis on the foraminifera and thecamoebians , but not sure which cluster method to use, I am between Ward's and Coniss and 'Euclidean' ?
I knew that (correct me if am wrong) Ward's usually used for clustering lateral samples, but what about coniss? in my case I have vertical section where I collected my samples from bottom to top!
I'm just wondering if benthic foraminifera Gavelinella species extinct during the Cretaceous or not? if so could you please refer some papers, and if not could please also refer some papers?
I'm interested in the quality of the image. If so, can you share your images? Alternatively, do you have a relatively inexpensive setup (less than $5k) to image forams (including software) and pictures to share?
Dear foram experts,
The chambers of some of my foraminifera (Ammonia sp.) are partially–fully filled by some black material in contrast to the yellow cytoplasm. Could anyone tell me what it might be?
The foraminifera are from recent tidal sediments and are around 150 μm across.
Pt.: Foram encontradas encontradas algumas pérolas negras num pacote argiloso, provavelmente formado no Pleistoceno Inferior ou Médio, juntamente com artefatos e seus subprodutos. Todo material não é reconhecido como arqueológico, estou fazendo estudos para comprovar. Acredito que as pérolas são subprodutos da alimentação malacológica. É a este tipo de uso que me refiro.
Ing.: Some black pearls were found in a clay pack, probably formed in the Lower or Middle Pleistocene, along with artifacts and their by-products. All material is not recognized as archaeological, I am doing studies to prove it. I believe that pearls are by-products of malacological food. It is this type of use that I am referring to.
In the future, we will be trying to perform oxygen and carbon stable isotope analysis on algal-bryozoan reefal limestone samples and foraminifera collected from it. We have an IRMS at our disposal. I am interested in which is the standard procedure of sample preparation.
I'm searching for an equation to relate the Mg/Ca ratio with temperature in the planktonic foraminiferan Turborotalita quinqueloba. It appears that multi-species calibrations previously studied do not include this species, so I am wondering if the relationship has been investigated.
Thanks in advance,
Looking at my Messinian sea sediments with the SEM, I found many foraminifers completely dissolved (the calcite wall was replaced by other mineral, but the shape of the original wall was intact). This dissolution doesn't affect the coccolith present at the same level, that were with no clear sign of dissolution.
In the literature this is widely reported ( Chiu and Broecker 2008), but I didn't found any explanation for this. Is a matter of a different surface area to volume ratio? Is a matter of incorporation of Mg in the wall text? Someone has some explanation?
I;m facing difficulty in identification of Nummulites, Assilinas, Ranikithalia, Lokhartia, operculina species as working on biostratigraphy and microfacies analysis of Early Eocene Formation from Nothern Himalayas, I needed relevant data,
thanking of anticipation..
Hello RG micropal. Researchers,
I need help with the identification of foraminifera –please find attached pic.
Here some info: recent sediments sampled from 100 m water depth in the SE Mediterranean.
-Spiral side is slightly convex with about 2 whorls (4-5 chambers in the last one) and seems smooth. Sutures depressed on both sides.
-The chambers on the umbilical side and periphery are perforate. Umbilical side is somewhat concave and with a noticeable wide open umbilicus and aperture which might resembles of Trochammina inflata (although not agglutinant).
How can I remove organics in the form of fecal pellets and mucus from deep water sediment-trap, without harming (dissolving, breaking…) carbonates (planktic foraminifera, pteropods) and silicates (diatoms, radiolarians) organisms?
I would appreciate any recommendation or if someone knows a protocol as reference.
The D47 temperature of top samples (off course weathered) from middle Eocene carbonates of Kutch, indicating lower temperature of 270C while corresponding benthic foraminifera temperature is above 350C and back calculated d18O (VSMOW) are relatively depleted (-1 per mil) then the rest of the samples (>2 permil).
I am currently looking at the Nariva and Cunapo Conglomerate Formations of Trinidad, which have in the past been characterized as being wildflysch. The Nariva generally lacks calcareous foraminifera but yields agglutinated ones, while the Cunapo contains fragments of coal, coral and beachrock. I am wondering if this was a Gilbert fan-type delta. Hence my interest in your project.
I have some samples from the Upper Cretaceous shale, North America.
I was able to obtained SEM images for what I believe some foraminifera genera; they are benthic forams. So far I identify some of them as possible as I can, but how I can be sure if my identifications are correct? Any suggestions?
Please see the attachment files as examples for some of the forams I found.
Can foraminiferal paleontologists or interested colleagues help me to identify this species of agglutinated benthonic foraminifera from Paleogene of Egypt??
I suppose it is new species of Gaudryina...or not??
please be calm with my attached photos as i took it by my camera not attached with microscope,, so it may be low in resolution. Thank you.
A few papers have shown that the ∆d13C gradient between epibenthic and infaunal foraminifera can be used to calculate bottom water [O2]. However, I have yet to find an equation for performing these calculations. Can anyone familiar with this process explain the mathematics behind this conversion? Thanks in advance.
Could someone help me please in how I can create a range chart for microfossils? in my case foraminifera?
I know some or few about how to do range chart, but I need more resources to create it. Please if you have any paper or book about the subject, could you let me know?
Thank you in advance.